Abstract: Disclosed is a pet portal that allows various sizes of pets to easily enter/exit a house through a baffle opening and trap tunnel. The baffle opening made out of a flexible insulating material that bounces back into its original shape after being disturbed when an animal passes through the portal. While in the closed orientation, the baffle material blocks the outdoor environment, maintaining a constant and comfortable temperature inside the house and prevent entry of insects.

Abstract: There is provided a door hatch assembly for an aperture in a screen door, the assembly including a substantially round rim mountable on a periphery of the aperture; a static member mounted in the rim and configured to cover at least a first portion of the aperture; and a hatch engaged with the static member and movable over the static member to reversibly cover at least a second portion of the aperture.

Abstract: A security panel system that is adapted to protect innocent bystanders from gunfire in the event of a shooting. The security panel system includes a main body having a first rail, a second rail, a panel, and a locking mechanism. The first rail and the second rail may each be mounted adjacent to a window and movably secure a panel therebetween. The panel is movable between an opened position and a closed position. The locking mechanism is configured to secure the panel in the closed position. It should be appreciated that, while the panel is in the closed position, the shooter may not be able to see or fire through the window due to use of the security panel system.

Abstract: A two-sided door usage safety system for preventing door related injuries includes a housing having a front end and a rear end each having a first engagement mechanism. The housing is configured to fit through a sensor aperture in a door. A pair of motion sensors and a pair of LED indicators are coupled within the front end and the rear end. A logic chip and a battery are coupled within an inner cavity of the housing. Each of a pair of face plates has a central viewing window and a second engagement mechanism that is selectively engageable with the first engagement mechanism. The pair of motion sensors and the logic chip are configured to detect when two people are simultaneously approaching the door from either side and to illuminate the pair of LED indicators to warn the people to open the door with caution.

Abstract: An innovative ballistic door is disclosed that is destined for use in schools, offices and building structures. The innovative door comprises a hybrid ballistic core, comprising at least two sections, wherein one section is a heavy impact resistant material rated to NIJ level III strength to resist rounds fired from high-powered rifles, as well as resisting breaches from explosive devices such as pipe bombs and the like. AR500 steel plate having a thickness of ¼ inch meets this requirement. The remaining sections of the innovative ballistic hybrid core comprise at least one lighter-weight ballistic sheet material, such as E Glass fiber composite sheet, which at least comply with the NIJ level IIIA standard. This E Glass material is ideally suited to resist the impact of a pipe bomb explosion. The novel ballistic core construction allows a compromise between protective and practical weight requirements.

Abstract: A thermal window comprising a thermally transparent window member, a window frame for receiving the thermally transparent window member, and at least one transmitter configured to transmit electromagnetic radiation with a frequency from 3 Hz to 300 GHz. The thermal window also has a cover for protecting the thermally transparent window member, wherein the cover may be mounted to the window frame by a spring loaded hinge.

Abstract: A blast and projectile resistant gun port is provided with both a roller-slide mechanism and a lever-actuated, spring-loaded, cam mechanism which a shooter operates to open or close a gun-port door over a gun-port opening in a gun-port frame, as well as to translate the gun-port door out of the way of the gun-port opening. The shooter is able to effect these actions by nudging the lever on the cam mechanism with or without placing one or more hands on the lever and is thus able to keep both hands on weaponry. The gun-port door keys into its closed position, and an elastic weather seal is squeezed firmly between the gun-port door and the gun port frame when the gun-port door is closed. The squeezing of the weather seal is effected by springs in the cam mechanism. The gun-port door and the components and subassemblies are easily and rapidly replaceable.

Abstract: A security cover device for a door viewer inserted into a door includes a housing configured to couple to a door with a door viewer, an eye piece movably coupled with the housing, and a shutter assembly. The shutter assembly includes a shutter member disposed within the housing, the shutter being configured to alter the amount of light passing through the housing, and an actuator in communication with the shutter member to selectively reposition the shutter member with respect to the housing from a first shutter member position to a second shutter member position, wherein the actuator is actuated to reposition the shutter member in response to the eye piece being moved in relation to the housing.

Abstract: A method of manufacturing a refrigerator door is provided. The method includes installing a display portion on a rear surface of a front decoration, the front decoration defining a front external appearance of the refrigerator door, coupling door decorations to both side ends of the front decoration, the door decorations defining both side external appearances of the refrigerator door, coupling cap decorations to upper and lower ends of the front decoration to which the door decorations are coupled, the cap decorations defining top and bottom external appearances of the refrigerator door, injecting foam liquid into a space defined by the front decoration, the door decorations and the cap decorations, and coupling a door liner to a rear of the front decoration.

Abstract: The present invention is directed toward a security cover for a door viewer such as a peephole. The security cover includes a housing having a forward opening configured to align with the peephole, a rearward viewing port, and an eyecup. The security cover further includes a shutter mechanism that is manually repositionable from a closed position to an opened position via engagement of an actuator. In operation, the security cover is coupled to a door such that it covers the door viewer.

Abstract: The present invention is directed toward a security cover for a door viewer such as a peephole. The security cover includes a housing having a forward opening configured to align with the peephole, a rearward viewing port, and an eyecup. The security cover further includes a shutter mechanism that is manually repositionable from a closed position to an opened position via engagement of an actuator. In operation, the security cover is coupled to a door such that it covers the door viewer.

Abstract: A through-door arm access porthole assembly includes a first porthole member securely mounted upon an exterior side of a door. The first porthole member is a rigid plate having a front side, a back side, an opening disposed therethrough, and further having a tubular portion aligned with the opening and extending from the back side. The tubular portion extending through the door from the exterior side to an interior side thereof. A second porthole member is securely mounted upon exterior surface of the door. The second porthole member is a rigid plate having a front side, a back side, and further having an opening disposed therethrough. The first porthole member and the second porthole member are fastened together with fasteners with the opening of the first porthole member and the open of the second porthole member in alignment. A seal member is disposed across the opening of the first porthole member and across the opening of the second porthole member and includes a plurality of resilient flap members.

Abstract: The present invention is directed toward a security cover for a door viewer such as a peephole. The security cover includes a housing having a forward opening configured to align with the peephole, a rearward viewing port, and an eyecup. The security cover further includes a shutter mechanism that is manually repositionable from a closed position to an opened position via engagement of an actuator. In operation, the security cover is coupled to a door such that it covers the door viewer.

Abstract: The invention relates to an inspection port, and a housing with an inspection port, for use in inspecting an interior volume. The housing has a housing enclosure with an inspection opening at or over which the inspection port is mounted, either directly to the housing enclosure or to a base which in turn is mounted to the housing enclosure. The inspection port has a rotatable assembly, rotatably secured to the housing enclosure or base for rotation about an axis of rotation at the inspection opening. The rotatable assembly has a plate defining an access opening and an inspection enclosure attached to the plate around the access opening and adaptable to extend into the interior volume. The inspection enclosure has a region with a window opening which has a window axis and is adaptable to provide lines of sight into the interior volume.

Abstract: A window made from a transparent material is designed to fit through a slat of a accordion type of storm shutter that is capable of being mounted when the storm shutter is mounted to the window, door and the like of a premise. The window includes a large diameter portion that is larger than the cut-out in the slat and a smaller diameter portion with outside threads fits through the cut-out. A ring on the other side of the slat engages the threads to thread the window to the slat. Other fitting on the window are contemplated by this invention.

Abstract: A refrigerator door is provided. The refrigerator door includes a front decoration defining a front external appearance of the refrigerator door, a door liner provided at a rear of the front decoration to define a rear external appearance of the refrigerator door, a pair of cap decorations provided on upper and lower portions of the front decoration to define top and bottom external appearances of the refrigerator door, a pair of door decorations coupled to both sides of the front decoration to define both side external appearances of the refrigerator door, a display portion interposed between the front decoration and the door liner, and an insulating layer interposed between the front decoration and the door liner.

Abstract: The present invention relates to a refrigerator in which a front of a door is made of a glass plate and a display portion for showing and controlling a condition of the refrigerator is positioned on the rear of the glass plate not to protrude outward. The present invention comprises a door main body including: an outer door 50 defining a front of the door and having a display accommodating portion 54 defined by depression, a door liner 56 installed on the rear of the outer door 50, and upper, lower, left and right decorations for coupling them. In addition, the display accommodating portion 54 in the front of the door main body is mounted with a display portion 70 for showing and controlling a condition of the refrigerator. Also, a front glass plate 80 is installed on the front of the door main body and display portion 70.

Abstract: An exemplary embodiment provides for a device for selectively blocking a view through a door viewer includes a ring mountable over a door viewer wherein the ring encircles the door viewer and a cover rotatably coupled to the ring.

Abstract: A garage door window has an outside frame member which has an inside frame member connection. The inside frame member has a protrusion connecting with the inside frame member connection. There is also an outside retainer channel, an inside retainer channel and an outside retainer fitting within the outside retainer channel, with an inside retainer fitting with the inside retainer channel. The inside retainer is nondestructively removable relative the inside retainer channel by a snap fit. An outside track is formed on the outside frame member, between a central inside face of the outside frame member and the outside retainer. An inside track is formed on the outside frame member, between the outside retainer and the inside retainer. A screen is mounted on the outside track, a fixed window mounted on the outside track; and an active window is mounted on the inside track.

Abstract: The present pet door panel or module comprises an interior pocket flap assembly cassette opening and an external frame forming a security panel track permitting a flap assembly cassette and security panel to be slidably received or removed to facilitate changing the height of the portal opening in the pet door panel or module to accommodate various size pets in the field by the consumer without the need for tools. This methodology can be applied to existing pet door panels currently in the market with modifications to framing members in the lowermost portion of their one piece aluminum frame construction; thereby permitting the use of a universal module or frame with changeable flap assembly cassettes for different types and sizes of pets during manufacture or in the field by consumers. In this manner consumers need not purchase a new pet door when they change a pet, they need only purchase/replace the flap assembly cassette.

Abstract: A first substantially transparent window, a tinted window, and a tinted window moving device may be provided in an automobile. The tinted window moving device can be controlled to place the tinted window in a first state or a second state. In the first state the tinted window is substantially aligned with the first substantially transparent window so that in order to see out of the first substantially transparent window, an individual must look through the tinted window also. In the second state the tinted window is not substantially aligned with the first substantially transparent window, so that an individual can see out of the first substantially transparent window without looking through the tinted window also.

Abstract: A door with a moveable window sash and a method of operating the same. The door includes vertical jambs with vertical channels. A window sash is movable in the vertical channels. A retractable screen assembly is attached to the door. The retractable screen assembly includes a roller, a flexible screen attached at a first end to the roller and at a second end to the movable window sash, and a biasing mechanism adapted to apply a continuous torque to the roller. The torque generates a positioning force on the window sash equal to at least 50% of the force of gravity acting on a window sash, such that the window sash can be positioned at an infinite number of locations along the vertical channels.

Abstract: An appliance for a room door serves to display a message at both the inside and outside faces of the door and further enables one at the inside face to observe individuals and activities beyond the outside face. The appliance includes an interior unit against the inside face of the door, an exterior unit against the outside face of the door, an operating shaft extending through the door and between the two units, and a viewer that extends through the operating shaft and clamps the units against their respective faces of the door. Each unit has a cover provided with a window and a message wheel, a portion of which is exposed for viewing through the window in its cover. The message wheels are engaged with the operating shaft, so that they rotate in unison and display like messages through the windows in the covers of their respective units.

Abstract: An integrated peephole, door knocker, and door decoration support hanger constructed as an integral unit to aid in a single installation and preservation of an outward facing door.

Abstract: A flange (1) for optical flame observation in a gas turbine includes at least one bore for optical observation, in which bore there is arranged at least one pane (9, 10) for separating the flame-side space, which is in substantially direct communication with a combustion chamber in which the at least one flame that is to be monitored is arranged, from the outside space, from which the observation of the at least one flame can take place. In a flange (1) of this type, fogging of the at least one pane (9, 10) is made possible in a simple manner which can be guaranteed over a prolonged period of time by virtue of the fact that two panes (9, 10), which delimit a sealed intermediate space (22) in the bore for optical observation, are arranged one behind the other with respect to the optical axis (8), and that a device (24) for dehumidifying the sealed intermediate space (22) is includes.

Abstract: A powered access window for machinery includes a powered window pane, two track members, an actuation device. The powered access window replaces a window pane in a sliding door of an automatic safety door. Each track member extends from an opposing end of the sliding door. Preferably, at least two roller bars are slidably received by a roller track member. The roller bars are also attached to one end of the powered window pane. The other end of the powered window pane is slidably retained by a retention track member. The actuation device is preferably attached to the roller track member. An actuation member of the actuation device is attached to the one end of the powered window pane. The actuation member makes a lateral motion relative to a body of the actuation device to raise and lower the powered window pane.

Abstract: An auxiliary window assembly is adapted to be installed adjacent an aperture formed in a lower portion of a vehicle door. The vehicle door can be of the type that includes a window opening formed in an upper portion thereof. The auxiliary window assembly preferably includes a windowpane member and a shield member, each of which is operable to be controlled by a window regulator mechanism or the like to move from an upper closed position visible in the aperture to a lower open position. The auxiliary window assembly also includes lighting mounted in the door adjacent the aperture.

Abstract: A conventional commercial door viewer includes a lens at one end for providing a wide angle view and a hollow end through which a person would look. A truncated cone shaped plug fits within the hollow end to block light transmission through the door viewer. The plug is readily manually removable to use the door viewer and includes a removable lanyard to tether the plug in proximity to the door viewer.

Abstract: A ventilator for installation in a garage door. It preferably fits in place of a standard garage door panel or into the panel. The ventilator includes a frame fitting into the door in place of a panel. The ventilator has openable and closeable louver slats exposed to the outside of the door and operated by a crank located on the inside of the door for adjustment of the louver slats to the desired position. A screen of appropriate mesh is installed on the frame on the inside of the garage, covering the inside such that insects may not enter the garage when the louver slats of the ventilator are open. The ventilator is preferably made of aluminum or other metal and is of sufficiently robust construction as to deter forcible intrusion, particularly when the ventilator is closed.

Abstract: A readily available conventional commercial door viewer includes a lens at one end for providing a wide angle view and a hollow end through which a person would look. A truncated cone shaped plug fits within the hollow end to block light transmission through the door viewer. The plug is readily manually removable to use the door viewer and includes a removable lanyard to tether the plug in proximity to the door viewer.

Abstract: A safety-type viewing window assembly for protective housings and protective doors of material-processing machines, such as grinding or metal-cutting machines. The assembly includes a fixed, transparent glass pane coupled along its periphery to a fixed, transparent, puncture-proof or unbreakable protective pane made, for instance of polycarbonate. The glass pane is on the side of the assembly toward the machine and the protective pane is on the side toward the user. The glass pane has a circular opening which is covered by a circular, transparent, rotatable window made of transparent glass which is coupled, on its side facing toward the protective pane, to a rotary drive mechanism. The diameter of the rotatable window is slightly less than the diameter of the opening in the glass pane. The rotatable window is disposed inside the opening in the glass pane, and the gap between the periphery of the rotatable window and the opening in the glass pane is sealed.

Abstract: A door provided to a lavatory unit allowing the access of users is equipped with a vent louver mounted to an opening perforated to the lower portion of a door body 110 via a frame 115 of the door. The vent louver 130 comprises a ventilation 131 having plural air holes, a mounting portion 133 provided to the upper side of the ventilation 131 and equipped to the door body 110 with a fastener 140, and a mounting portion 135 for fixing the lower portion of the ventilation 131 to the door body via the door frame 115. The lower mounting portion 135 of the vent louver 130 comprises a connector 135F connected to the outer wall of the frame 115, and an elastic connector 135S comprising a leaf spring 1350 inserted to the frame 115 and flexibly applied to the inner wall of the frame.

Abstract: An apparatus for the viewing of an inmate in a cell while preventing the inmate from determining if he is being observed includes a frame enclosure with means for securing the apparatus about a cell window attached to the frame structure. A two-way mirror is attached to the frame enclosure and disposed proximate the cell window. A sheet of light attenuating material is disposed in the frame enclosure in planar alignment with respect to the two-way mirror a predetermined distance therefrom to darken the area intermediate the two-way mirror and the sheet of light attenuation material. Means for viewing through the two-way mirror are provided which include a lens or a video camera and display. An optional slot allows for manual positioning of the lens to permit optimum viewing into the cell. The means for securing includes a plurality of magnets disposed around the perimeter of the frame enclosure or by use of a hook and loop fastener.

Abstract: The present invention 10 discloses a safety mirror 10 designed to be attached to the outside of an outwardly opening door 14 and to be viewed from the inside of the door by the user 12 looking through the fireproof door window 18. The safety mirror 10 has a housing 42 open 43 on its lateral sides having two generally vertically positioned convex mirrors 48 mounted therein being oppositely disposed so that the viewer 12 can see to the left 38 and to the right 40 for traffic moving toward or away from the path of the outwardly opening door 14. The housing 42 of the device has a flange 44 about its periphery and has fastening means 47 for attachment to the outside of the door 14. The device also has an LED 50 mounted in its housing which is viewable from the front of the device or from either side of the device.

Abstract: A method of supporting an ornament on the exterior of a door uses a peep hole fixture to mount a hanger piece. The hanger piece is a flat metal strip having a hole in one end sized to be received on the peep hole fixture barrel while being captured by a flange on the fixture. A hook on a depending end of the strip provides an attachment feature for holding the ornament.

Abstract: The audio peephole for doors (T) comprises two flange bushings (2, 3), which are inserted into one another and held together by a two-piece screw-type optical spy-hole (1), with the flange bushings (2, 3) having in their flange (2a, 3a) a central reception hole (4) for the optical spy-hole (1) and at a distance around this central reception hole (4) a plurality of sound apertures (5) penetrating the flange (2a, 3a) and terminating in the hollow space (H) of the flange bushings (2, 3). These sound apertures (5) can be opened for sound transmission and closed against sound transmission by means of a manually rotatable apertured disk (6) provided behind the flange (2a) of the flange bushing (2) on the interior of the door.

Abstract: A communication portal including a circular interior component comprising an outer plate and an inner plate. The outer plate has a plurality of apertures therethrough. The outer plate has an arcuate slot therethrough. The inner plate has a plurality of apertures therethrough. The inner plate has a knob extending outwardly therefrom. The inner plate is urged against the outer plate with the knob extending through the arcuate slot whereby shifting of the knob to a first position will align the apertures of the outer plate and the inner plate. Shifting of the knob to a second position will disalign the apertures. Also included is a circular exterior component comprising a singular plate. The singular plate has a plurality of slots therethrough. The plurality of slots are aligned with the plurality of apertures of the outer plate of the circular interior component. The singular plate is coupled with the circular interior component within an opening in an existing door.

Abstract: A pet door assembly for insertion within a hole formed in a wall having a pair of exterior frames and an inner frame. The exterior frame members mount to opposite sides of the wall and define an opening for allowing passage of a pet. The central inner frame is located between the pair of exterior frames and define an opening generally aligned with the openings in the exterior frames. The inner frame includes mounting structure for mounting centrally a door in the inner frame and over the pet passageway. Appropriate assembly structure secures the exterior frames and the central frame together.

Abstract: An entrance door for office or residence that has a main door equipped with a sub door where the main door is set locked when the sub door is opened. Dimension of the sub door is selected as big enough for article transfer through it and small enough for avoiding human being invasion.

Abstract: A door structure includes a main door having an opening defined therein. A first and second auxiliary doors are hingedly fitted in the opening. A first and second latches are movably mounted on one end portion of the first and second auxiliary doors and are detachably engaged in a first and second notches defined in the main door. A first and second transmission mechanisms are respectively mounted in the first and second auxiliary doors for controlling the first and second latches to be detachably engaged in the first and second notches. A first and second driving members are respectively mounted in the first and second auxiliary doors for driving the first and second transmission mechanisms. A linking rod is connected between the first and second driving members such that the first and second driving members are able to operate synchronously so as to detach the first and second latches from the first and second notches synchronously via the first and second transmission mechanisms respectively.

Abstract: A two-window closure for the rear opening of a van to obviate a spare tire obstruction in which one window is coextensive with the spare tire and remains in place unless the spare tire is traversed out of the way, but the other window being coextensive with the remainder of the window opening can be opened without traversing the spare tire and thus provides the user with access into the rear of the van.

Abstract: The present invention is directed to a mail slot mounting assembly which can be easily installed onto the cross-bars of an existing door without the need for welding or extensive cutting operations to the door frame. The mounting assembly has upper and lower face plates each having an inner surface to be mated and a first pair of wall members running longitudinally along and substantially perpendicular to each of said inner surfaces. The inner surfaces of the upper and lower face plates are configured so that, upon mating the face plates, the first pair of wall members align to form outer channel regions extending longitudinally along and perpendicular to the face plates, the outer channel members being adapted to receive mounting members located in a door. The mated face plates are then configured to receive a mail slot apparatus.

Abstract: A closure construction and mounting assembly comprising: a steel frame in a rectangular configuration having horizontal parallel upper and lower extents and vertical parallel interior and exterior side extents with a central aperture extending therethrough; a panel positioned within the central aperture, the panel having a gridwork of horizontally disposed steel members and vertically disposed steel members in a gridlock configuration to form rectangular apertures extending therethrough, with the spacing between the apertures sized such as to preclude the passage of a person therethrough; coverings secured to the panel peripherally and in contact with the steel members to cover the apertures; and adjustment mechanisms for moving the panel between a locked and unlocked orientation.

Abstract: A vertical hollow enclosed main member with hinged access doors. Grill shelves made of intermittent rod members are attached in an internal arrangement for holding food, especially meat for cooking using charcoal or wood for fuel. The internal hollow area of the main member is divided by a manually adjustable partition member to provide precise controlled indirect heat and smoke. The partition also diverts rendered waste from being reburned therefore enhancing the quality of food produced.

Abstract: According to the invention, a window (11) having an aperture (40) therein also includes a moveable, secondary window assembly (10) mounted on one side of the window aperture (40), such that the secondary window assembly (10) is moveable from a position closing the window aperture (40) to a position wherein the window aperture (40) is at least partially open. The secondary window assembly (10) includes a frame member (20), a secondary window (26) mounted within the frame member (20), and mounting means (41, 42, 51) for mounting the frame member (20) upon the window 11. The mounting means (41, 42, 51) includes at least one flexible hinge pin (41) affixed to the frame member (20) and positioned through a hinge pin aperture (42) through the window (11).

Abstract: A shutter window assembly including an aluminum window frame unit consisting of an outer window frame and a shutter, the shutter consisting of two stiles, a top rail, a bottom rail, and a plurality of horizontal louvers, two pairs of coupling blocks to connect the top and bottom rails to the stiles, two hinge devices connected between the shutter the outer window frame permitting the shutter to be retained within the outer window frame, and a shutter transmission mechanism installed in the aluminum window frame unit and controlled to open and close the shutter, the shutter transmission mechanism including a motor drive installed in the bottom rail of the shutter and having an output shaft disposed in one stile of the shutter, and a plurality of transmission devices disposed inside one stile and connected between the output shaft and the louvers, each transmission device including a gear box coupled to the motor drive, and a transmission rod coupled between the gear box and one louver and driven by the motor d

Abstract: A combined door knocker and viewer utilizes the from portion of the central breast plate area of the body of a door knocker as the forwardmost element of a lens system, permitting the viewer wide angle viewing of the area forward of the door undetected by the caller, who has no reason to suspect that the breast plate of the knocker coat-of-arms is also the front lens of a viewer.

Abstract: An insulated door for use in a refrigerator having an ice and water through the door dispenser is made by attaching a liner for housing the dispenser on the rear face of the door in line with a front opening. The liner is secured to the door as are the hinge bearings and a tube extends between the liner and the lower hinge bearing for conducting electrical wires and a water tube. The only opening in the liner is at a point to receive ice cubes from the dispenser in the refrigerator and this opening is covered prior to foaming. The door is placed in a foaming fixture which completely enclosed and supports the door and the liner and foam is injected so that the foam, when expanded and hardened, completely covers the rear face of the door. After the door is removed from the foaming fixture, the thin layer of foam at the inlet opening is cut away and the door is completed by adding the liner and the gaskets and other hardware as well as the dispensing unit itself.

Abstract: A modular pet access door unit for insertion into a hole cut into a door or wall has exterior frames and spacer frames, fastened together by fasteners extending horizontally through brackets in the spacer frames. The spacer frames have tongue and groove surfaces for nesting with each other. Both exterior frames may carry a pet access door. A security cover mounts on posts with annular grooves, and may be moved horizontally into position to cover the pet opening, where sliders in the security cover with keyhold-shaped holes engage the post annular grooves. The pet door is captured in the frame between the frame and a door or flap holder that is secured to the frame by removably fasteners. An automatically adjustable sill is movable by magnetic attraction to the flap bottom, where its position is secured by fasteners.

Abstract: A modular pet access door unit for insertion into a hole cut into a door or wall has exterior frames and spacer frames, fastened together by fasteners extending horizontally through brackets in the spacer frames. The spacer frames have tongue and groove surfaces for nesting with each other. Both exterior frames may carry a pet access door. A security cover mounts on posts with annular grooves, and may be moved horizontally into position to cover the pet opening, where sliders in the security cover with keyhole-shaped holes engage the post annular grooves. The pet door is captured in the frame between the frame and a door or flap holder that is secured to the frame by removably fasteners. An automatically adjustable sill is movable by magnetic attraction to the flap bottom, where its postion is secured by fasteners.