Abstract: The present disclosure provides a connector capable of improving dissipation performance while suppressing enlargement. A connector 10 includes a connector housing 11 and terminals T to be accommodated into the connector housing 11 and electrically connected to a mating device. The connector housing 11 includes upper slope portions 41a, 41b inclined with respect to a horizontal direction at positions vertically above the terminals T in a state mounted on the mating device. Breathable upper breathable films 44a are provided in upper through holes 43a, 43b provided in the upper slope portions 41a, 41b.

Abstract: An air conditioner indoor unit includes a body including an air outlet, an outer air deflector provided at the air outlet and configured to open and close the air outlet, and an inner air deflector located at an inner side of the outer air deflector. The inner air deflector includes a plurality of vent holes penetrating the inner air deflector in a thickness direction of the inner air deflector. A total area of the plurality of vent holes is not smaller than 50% of a total area of the inner air deflector.

Abstract: A motor vehicle device has a device interior in which a water-containing lubricant is held in order to lubricate at least one component arranged in the device interior. The device interior is fluidically connected to a venting apparatus for pressure equalization with the environment surrounding the motor vehicle device. The venting apparatus has a semipermeable membrane, which is water-impermeable in a first direction, i.e. from a first surface of the membrane to a second surface. The first surface of the semipermeable membrane faces the device interior and therefore the semipermeable membrane seals off the device interior from the environment surrounding the motor vehicle device in such a way that water and water vapor cannot permeate.

Abstract: Two disks are consecutively disposed transversely to a flow direction in an air vent for a passenger compartment of a motor vehicle, serving as air deflection elements that include mutually intersecting slots, through which a rod that is pivotably mounted in a ball and socket joint passes, so that the air deflection elements can be moved transversely in the air vent by way of the rod. By moving the air deflection elements, an air current through the air vent can be guided to the side, and thus air flowing out of the air vent can be guided obliquely to the side in any arbitrary direction.

Abstract: So as to guide an air current flowing out of an air vent for a motor vehicle, an air deflection element, which can be moved transversely in an air channel of the air vent, is disposed upstream of an air guide body in a flow direction, which includes air passages, for which the air deflection element includes congruent windows.

Abstract: A flow restrictor element, especially for restricting the air flow in an air duct system of a vehicle, comprises a ring-shaped restrictor element carrier (12) to be arranged on a flow guide duct as well as at least one restrictor element (28). The at least one restrictor element (28) is arranged within the restrictor element carrier (12), radially inwardly in relation to a central axis (M) of the flow restrictor element (10) and is detachable from the restrictor element carrier (12) for changing a restriction cross-sectional area, wherein a locking device (16) is provided on an outer circumferential area (14) of the restrictor element carrier (12) for locking the restrictor element carrier (12) on a flow guide duct.

Abstract: A vent, preferably made of metal, comprises a body (10) having an aperture (24) for the passage of a fluid and a sealing surface (11) surrounding the aperture. A porous membrane (50) lies against the sealing surface (11) and covers the aperture (24). A clamp arrangement may comprise a spring (30) pressing the membrane against the sealing surface (11) to prevent liquid from passing through between the sealing surface (11) and the membrane (50), e.g. by means of a cap (40) secured to the body (10) of the vent. The clamp arrangement is such that upon a reduction of the membrane thickness by 50% in the clamping area the compressive force per unit area does not change by more than 50%.

Abstract: A seal for a meter housing with an interior portion is disclosed. The seal includes an axially inner surface configured to face the interior portion of the meter housing and an axially outer surface configured to face away from the interior portion of the meter housing. At least one of the axially inner surface and the axially outer surface is configured to seal against a portion of the housing. The seal further includes a diaphragm defined axially intermediate the axially inner surface and the axially outer surface and a fluid passageway defined through a portion of the diaphragm. The fluid passageway is configured to move between an open position and a closed position in response to a pressure differential between the interior portion of the housing and an exterior portion.

Abstract: A bracket assembly suitable for use with an electronic device is described. The bracket assembly may include a bracket body having a channel. The bracket assembly may further include a membrane embedded in the bracket body and designed to allow air, but not liquid (such as water), to pass through the membrane. The membrane may be at least partially surrounded by a membrane support molded to the membrane. The membrane and the membrane support may be disposed in a molding tool to receive a material used to mold the bracket body over the membrane and the membrane support. During the molding operation, the membrane support may act as a buffer to shield the membrane from temperature and pressure increases associated with the molding operation of the bracket body. The bracket assembly may improve the ability of the electronic device to prevent liquid ingress.

Abstract: A pressure compensating device includes a diaphragm and a holding element. The holding element has a bearing surface facing the diaphragm. A cohesive or materially-bonded connection is formed at the bearing surface between the diaphragm and the holding element. The diaphragm is fixed to the bearing surface of the holding element by the cohesive connection. A cover which is fixed to the holding element has at least one first receiving device or receptacle at least partly receiving the diaphragm. The cover presses the diaphragm at least partly onto the cohesive connection and presses the cohesive connection onto the bearing surface of the holding element. A housing component having a pressure compensating device and a control unit having a housing are also provided.

Abstract: A ventilation member includes: a first metal body including a flat portion having a first through-hole formed therein; an air-permeable membrane having a first principal surface and a second principal surface and placed on the flat portion of the first metal body so that the first principal surface covers the first through-hole; a second metal body including a flat portion having formed therein a second through-hole separated from the first through-hole by the air-permeable membrane, the second metal body being placed on a second principal surface side of the air-permeable membrane so that passage of air is permitted between the first through-hole and the second through-hole through the air-permeable membrane; and a joint portion fixing the first metal body and the second metal body to each other. The air-permeable membrane has a portion located outwardly of an outer end of the flat portion of the first metal body and an outer end of the flat portion of the second metal body.

Abstract: The present disclosure discloses a vent and cover plate assembly for dust-free workshop floor, including a plurality of vents arranged on the dust-free workshop floor and cover plates that are each associated with a corresponding vent. The vents each include a hole and clamping slots arranged at an outer periphery of the hole, and the cover plates each include a cover body and clamping feet arranged at an outer periphery of the cover body. The cover body engages with the hole, and the clamping feet engage with respective clamping slots. The vent and cover plate assembly for dust-free workshop floor is firm and secure in engagement clamping and thus has small possibility of rolling over.

Abstract: A venting device for insertion into an opening (2) of an enclosure having a wall (3) with an interior surface and an exterior surface comprises a body (11; 21; 31) having an insertion portion (12; 22; 32) for insertion into the opening (2) of the enclosure and a head portion (13; 23; 33). The body (11; 21; 31) has a passageway (14; 24; 34) that extends through the insertion portion (12; 22; 32) and the head portion (13; 23; 33) for passage of a fluid from the enclosure (7) to the ambient environment (6). The venting device further comprises an air permeable, water impermeable venting element (15; 25; 35) covering the passageway (14; 24; 34). An engagement section (16; 26; 36) is arranged circumferentially about the insertion portion (12; 22; 32) for engagement with the wall (3) of the enclosure.

Abstract: An inlet valve for a central vacuum cleaning system having a central vacuum motor connected to a piping network, is disclosed. The inlet valve includes a main body having an air inlet passageway formed therethrough and a pipe connector to connect the air inlet passageway of the inlet valve to the vacuum piping. An outer door is provided which is pivotally mounted to the main body on an opposite side to said connector and an inner door is provided which is pivotally mounted to said main body at one end between the outer door and the main body and seals the air inlet passageway when the inner door is in a closed position. A releasable latch is operatively connected to the outer door to keep the outer door and the inner door closed on the front of the valve when the inlet valve is not in use and a spring is provided to cause the inner door and the outer door to open upon the latch being released.

Abstract: An insulated vent chute and blocking assembly which can be inserted between adjacently disposed roof rafters of a building construction having a pitched or flat roof, the roof supported by a building wall. The assembly comprises: a generally flexible insulated body having a roof facing surface, an attic space facing surface, the surfaces spaced apart from each other to define a pair of longitudinal rafter facing sides, a top and a bottom transverse end, the ends connecting the sides; and a reflective substrate covering the attic space facing surface, the substrate for reflecting heat away from the attic space facing surface and back into attic insulation. The assembly is fabricated from a flexible insulated material, and can assume an arcuate form in embodiments when the body is inserted between adjacently disposed roof rafters in the building construction with a pitched or flat roof such that the bottom transverse end can contact the top of the building wall.

Abstract: A ventilation member (1) comprises a support body (2), a ventilation membrane (10), and a cover part (3). The support body (2) includes a bottom surface portion (4) connected to the casing (50) and a side surface portion (5) on which the ventilation membrane (10) is installed. A first opening (4h) is formed in the bottom surface portion (4), and a second opening (5h) is formed in the side surface portion (5). The ventilation membrane (10) is installed on the side surface portion (5) so as to close the second opening (5h). The cover part (3) has a cylindrical side wall part (3b) that circumferentially surrounds the support body (2) in such a state that the support body (2) is assembled therein. The position of the second opening (5h) to be formed in the side surface portion (5) of the support body (2) is adjusted so that the ventilation membrane (10) is protected when the membrane faces the cylindrical side wall part (3b).

Abstract: A relaxation space, particularly a smoking room, of the type including elements for renewing the air which elements are provided with supply elements (8) and with suction elements (20), the renewing elements including holes distributed over the entire floor (13) and ceiling (9) of this space, characterized in that the holes at least in the floor (13) include at least two parts, namely a downstream part opening into the relaxation space and an upstream part larger in cross section than the downstream part, opening onto the other side of the floor (13).

Abstract: A pressure equalization device adapted to be operatively connected to an enclosure, the device including an air passage which, when the device is so connected to the enclosure, provides a fluid communication between the interior of the enclosure and atmosphere, the air passage containing a barrier wall comprising an air permeable membrane forming a micro-particulate filter.

Abstract: An apparatus for providing ventilation in a lower level of a building and for preventing mold and mildew from building up in an interior portion of such building while also preventing entrance of small unwanted animals. The apparatus comprises a frame member having each of a first predetermined shape and a first predetermined size and formed of a first predetermined material. A screen member is engageable with the frame member for attachment thereto, such screen member having each of a second predetermined shape and a second predetermined size and being formed of a second predetermined material. The apparatus is secured to the structure by one of masonry screws or is secured in new construction with bricks and brick mortar.

Abstract: A vent assembly for attachment to a fluid discharge conduit of the type connected to a clothes dryer, room exhaust fan, or the like is adapted to reduce or prevent the trapping of dirt or lint as well as flapping or vibration of the door in windy conditions. A mount having an opening is received on the conduit and a door is pivotally received by the mount. The door is operable for displacement with respect to the opening between an open position and a closed position when engaged by a fluid, such as air from a clothes dryer, flowing through the discharge conduit. A hood is pivotally mounted over the door and mount opening, and is operable for displacement with respect to the mount when engaged by the door and/or by fluid flowing through the discharge conduit.

Abstract: The air intake apparatus provides for additional auxiliary air to a wood or pellet burning stove. The apparatus is provided in more than one embodiment for fit to more than one type of stove. The curved T-handle controls the damper sleeve for dampened control of the auxiliary air.

Abstract: A vent structure includes: a first housing component having an opening portion for ventilation; a gas-permeable membrane that is attached to the first housing component to close the opening portion; and a laser welding portion that joins the first housing component with the gas-permeable membrane. The gas-permeable membrane includes a main body including a fluororesin film and a porous resin sheet that is laid on the main body. The porous resin sheet is located on the surface side of the vent structure. Both of the main body and the outer peripheral portion of the porous resin sheet that projects outwardly from the main body are fixed to the first housing component by the laser welding portion.

Abstract: A security grill for a security institution has an air inlet face, an air outlet face, and zigzag channels extending from a point adjacent the inlet face toward the outlet face. The zigzag channels are defined by slats which are bent at least twice in alternating directions. The zigzag channels are divided into segments each having a cross-sectional width. The segments adjacent the air outlet face have a cross-sectional width less than any of the other segments along the channel. The slats are bent at certain angles which are larger than those of conventional security grills. Corners are created along each slat as a result of bending the slats in alternating directions. The corners are rounded.

Abstract: A sealed enclosure is provided. The enclosure includes a membrane vent adapted to mount through a wall of the enclosure, the membrane vent comprising an air permeable tubular membrane, a tubular structural support, wherein the tubular membrane is stretched over the tubular structural support, an air vent fitting attached to the tubular membrane at a first end, and an end cap attached to the tubular membrane at a second end.

Abstract: Air vent covers for attachment to crawlspace walls, over or into air vent openings, to enclose the air vent openings and seal them against the entry of air and humidity from the atmosphere into the crawlspace. The preferred air vent covers comprises rectangular panels molded from durable plastic composition, with a flat outer surface surrounded by a recessed peripheral border provided with holes for receiving attachment means for fastening the cover to a crawlspace wall. The preferred rectangular panels are also molded with a recessed inner surface surrounded by a projecting peripheral border, and the recessed inner surface is provided with projecting reinforcing ribs which extend across the width of the panels to reinforce the panels against warpage when they are fastened to the crawlspace wall. Alternatively, the vent covers may be hollow tubular elements of durable plastic sized to be frictionally-engaged within an air vent opening in place of an air vent to seal the crawlspace wall.

Abstract: A portable outdoor enclosure protects occupants from at least some elements of nature and includes a wall panel forming an outer wall of the enclosure. The wall panel has an opening formed of sufficient size to allow an air conditioning unit to be inserted through the opening in the flexible material wall panel. A sleeve of flexible material is connected to the wall panel and extends in at least one of an inwardly direction and an outwardly direction. The sleeve includes at least one outer peripheral end spaced from the side wall capable of being snugly engaged with an external surface of an air conditioning unit to be installed through the sleeve. At least one flap can be provided for covering the opening through the wall panel when the air conditioning unit is not installed.

Abstract: A vent member (1) includes a support body (2) provided with a through-hole (3), a permeable membrane (6) closing the through-hole (3) in the support body (2), and a cover part (10) covering the permeable membrane (6). A ventilation hole (10a) is made in a ceiling portion (11) of the cover part (10) and a notch (10b) is made in a side wall portion (12) thereof. These ventilation hole (10a) and notch (10b) function as a passage for ventilation between the interior and the exterior of the cover part (10). The ventilation hole (10a) establishes a positional relation that it does not overlap a permeable region of the permeable membrane (6) in the axial direction. Further, the side wall portion (12) extends to the lower side in the axial direction below a position at which the permeable membrane (6) is disposed, and the permeable membrane (6) is protected entirely along a circumferential direction by the side wall portion (12).

Abstract: A trickle vent such as might be used in association with commercial windows is formed from PVC tubing in two convoluted paths. One or more expansion chambers are provided at turns or directional changes within the tubing which reduce or eliminate noise transmission through the vent. Where a plurality of expansion chambers are used, each chamber may be of different length to dampen a different portion of the acoustic spectrum. In a preferred embodiment, the expansion chambers are filled with an acoustic-type foam, and the ends are not completely sealed. The tubing preferably bridges two extrusions that form a supporting housing for the vent, and by using two separate extrusions bridged by the tubing, both thermal and acoustic isolation are maintained.

Abstract: A security module for use with a ventilation grating comprising a body, a base with a planar surface for attachment to the grating, and an outer wall extending from the base. The body has inner passageways extending from the base to the outer wall, the first portion of which extends from the base in a direction perpendicular to the base, and the second portion of which extends from the outer wall to intersect perpendicularly with the first portion within the body. The security module, when attached to a ventilation grating, prevents threading a rope-like material, through the grating, and using the make-shift rope to commit suicide by hanging, and is therefore particularly suitable for use in penal institutions, hospitals and mental health facilities.

Abstract: The present invention provides a connection adapter for use with a flexible or rigid conduit that fluidingly interconnects an intake or exhaust port of a ventilation unit and a conduit. The adapter comprises a unit coupler (10) having a central portion (60) with an aperture (70) and an elongated sleeve (80) aligned with the aperture (70) and extending from the central portion (60). The unit coupler (10) can be secured to a port of a ventilation unit such that the elongated sleeve (80) projects through a port into the casing of the ventilation unit. The adapter also comprises a conduit coupler (20) having a central portion (100) with an aperture (110) and an inner elongated sleeve (120) extending from the central portion (100) that is aligned with the aperture (110) of the conduit coupler (20).

Abstract: A self-closing vent intended for use in attics, crawl spaces, joist cavities, exterior walls, interior walls, or other structural element which allows for the free flow of air from outside a building to interior spaces during normal use. The vent includes a damper blade pivotally connected to, and disposed within, the vent housing, which is held in an open position by a temperature sensitive fusible link. Two, and preferably three, permanent magnets provide the force for driving the damper blade into a closed and locked position. A first magnet disposed in a side of the vent housing and a second magnet disposed on the damper blade are disposed with opposing (repelling) polarities when the damper blade is held in the open position. A third magnet disposed proximate the back of the vent housing is oriented so as to attract the magnet disposed on the damper blade.

Abstract: A system for drying the crawlspace of a home, reducing mold in the crawlspace and in the living area of the home, and that creates healthy air exchanges in the living area of the home with fresh air from the outside. The Negative Air Supplied (NAS) crawlspace system implements multiple drying theories to efficiently dry both porous and semi-porous materials in the crawlspace down to moisture levels too low for mold to grow. The present NAS system also creates a negative air pressure in the crawlspace, which causes the airflow in the home to go from the living area to the crawlspace. This airflow pattern prevents any mold spores in the crawlspace from entering the living area of the home. The airflow created by the NAS system also forces multiple air exchanges per day in the living area of the home with outside air.

Abstract: A metal vent having an aperture for the passage of a fluid, a porous membrane sealing the aperture, wherein the components of the vent are assembled by an interference fit.

Abstract: An inlet apparatus for central vacuum cleaning systems is described that can be integrated with registers commonly used with heating and air conditioning vents in residential or commercial buildings. In particular, the apparatus opens to provide a vacuum inlet that will either remove debris directly, or through an attached hose, using the suction provided by the connected conventional central vacuum cleaning system. The apparatus contains a register body and an inlet that can be integrated with the conventional pipe ductwork used for central vacuum cleaning systems. The apparatus will seal closed when not in use in order to provide full suction to any other inlet currently in use.

Abstract: A ventilation member having: a breathable film transmitting gas passing through an opening portion of a housing in a state in which the breathable film is fixed to the opening portion; and a support including a supporting portion for supporting the breathable film and an insertion portion to be inserted into the opening portion of the housing; wherein a lock structure for locking the support in the housing by rotating the support around a central axis of the support is formed in the insertion portion.

Abstract: A ventilation member having: a breathable film transmitting gas passing through an opening portion of a housing in a state in which the breathable film is fixed to the opening portion; and a support including a supporting portion for supporting the breathable film and an insertion portion to be inserted into the opening portion of the housing; wherein the insertion portion has a lock portion in an insertion-start-side end portion thereof, the lock portion having a tapered forward end, while the insertion portion is divided into a plurality of parts circumferentially at least on an insertion start side thereof.

Abstract: The present invention relates to ventilation tubing comprising, from the inside to the outside, a bush (1), an insulating layer (2) and a cover sheet (3). Said ventilation tubing is characterized in that the insulating layer is a quartz fiber wool of which the specific surface weight illustratively is between 65 and 140 g/m2. The bush (1) and/or the cover sheet (3) may be a plastic sheet exhibiting a weave of interlacing filaments.

Abstract: A ceiling vent assembly for providing a cover for bathroom exhausts fans. The ceiling vent assembly includes a ceiling vent assembly and a vent cover assembly which includes a support frame being securely and conventionally attached to the ceiling and being disposed about the vent; and also includes a cover frame being hingedly and securely attached with hinges to the support frame; and further includes a sheet of transparent material being securely and conventionally attached to the cover frame and being closeable over the vent; and also includes fasteners for removably attaching the cover frame to the support frame and closing the sheet of transparent material over the vent; and a handle assembly for opening and closing the sheet of material over the vent.

Abstract: A magnetically controlled flow system having a pivotable flap with a permanent magnet at distal ends. Two coils with magnetizable cores are mounted inside the duct and positioned so as to cooperate with the permanent magnet when the flap is in either a closed or an open position. By energizing the coils, the permanent magnet is attracted to the magnetizable cores in either one of the coils, thereby actuating the flap between the closed and open positions.

Abstract: A connector frame for use as a support member for mounting grilles at ventilation openings in a building structure. The connector frame allows the grills to be mounted in slightly different locations to hide imperfections at the edges of the ventilation openings. The connector frame may include a pair of single connector frames that may be separated into two singly usable frames.

Abstract: An embeddable air duct block includes a tubular member extending between a pair of rectangular plate members spaced from each other. The tubular member has a pair of open ends and an interior passageway. One plate member has an inner surface coupled to one open end and a plurality of holes in fluid communication with the interior passageway. The other plate member is coupled to the tubular member and has a duct opening aligned with the interior passageway. Two cement cavities are preferably formed on opposite sides of the tubular member. An air duct is formed in a concrete block wall by installing and securing the air duct block in the concrete block wall. The blocks are coupled together by cementing slurry poured into the cavities. Optionally, reinforcing bars can also be utilized within the cement cavities and at least one cavity of the concrete block wall.

Abstract: An elbow for use in a dryer duct assembly comprising at least one component for connecting a dryer vent outlet and an exhaust vent. The component has an inlet and outlet. The dryer vent outlet and one of the component inlet and outlet have a standardized diameter. The elbow comprises a body defining an interior flow passage for permitting the passing of dryer exhaust air through the body. A first end of the body terminates in a first edge to define an inlet opening to the interior flow passage. A second end of the body terminates in a second edge to define an outlet opening to the interior flow passage.

Abstract: A ventilation control system is disclosed for a building having an elongated ceiling vent opening, the system having a vent door, spaced apart brackets pivotally supporting the door on the building structure adjacent to the ceiling vent opening such that the door is movable between closed and opened positions, and an actuating mechanism for moving the door between the closed and opened positions. The vent door has an elongated door casing of plastic material having a hollow interior and opposite side walls, a support member located in the hollow interior of the door casing adjacent to each of the opposite side walls and a foam material substantially filling the hollow interior of the door casing. The door casing may be extruded from plastic material and has integrally formed outwardly extending sealing members which engage the building structure when the vent door is in the closed position to seal the vent opening.

Abstract: A double divisible connector frame for use as a support member for mounting return grilles and louvers in a building structure which is rectangular in shape and having a planar surface on one side and a pair of precisely-similar spaced-apart continuous rectangular flanged frames on the other side, and a lineal line of severance equidistant between said smaller flanged frames for dividing said double frame into a pair of similar smaller frames for mounting said grilles and louvers.

Abstract: A static ventilator provided with a deformable corrugated portion is described herein. The static ventilator is provided with a tubular base to be installed to the roof, a sleeve to be connected to the tubular base and a cover to be installed to the free end of the sleeve. The tubular base is provided with a deformable corrugated portion enabling the tubular base to be installed to a sloping roof while allowing the sleeve to be positioned and maintained in a generally vertical orientation. The present invention is also concerned with a method for forming a tubular base for static ventilator provided with a corrugated portion.

Abstract: A modular automatic power flow fresh air inlet comprising a housing having fresh air openings between a source of fresh air and a room, having an adjustable static pressure to be ventilated. The fresh air openings may be controlled by a valve plate pivotally connected to the housing at each opening. The valve plates pivot relative to the static pressure in the room. A cable having first and second ends extends through the housing and is connected to the valve plates via a lanyard. A cable control device for moving the cable between a forward position and a rearward position is connected to the first end of the cable. A cable counter weight is attached to the second end of the cable. Moving the cable toward the forward position places tension on the lanyard, causing the valve plate to pivot from the static position toward to the fully opened position. Moving the cable toward the rearward position relaxes the tension in the lanyard, causing the valve plate to pivot toward the static position.

Abstract: A ceiling ventilation inlet includes a housing having an air inlet aperture, an air outlet aperture, and a baffle supported for linear movement adjacent the air outlet aperture. A spring is positioned such that the baffle moves dependant upon air pressure difference between the confinement space and the external environment. Air entering the housing opens the baffle and enters the livestock confinement building in a 360 degree dispersion pattern. The spring causes the baffle to direct the flow of air into the confinement space at a near constant rate so as to optimize ventilation. The greater the air pressure difference between the confinement space and the external environment the greater the air outlet area becomes. Since the inlet is responsive to the pressure difference and the air outlet area increases or decreases in size, the airflow velocity entering the confinement space may be optimized at a near constant rate.

Abstract: A one-piece continuous roof drip edge vent comprising an upper planar section a middle louvered section and a lower section. The upper section extends up an inclined roof so that a starter row of shingles is not necessary, the lower section abuts the horizontal facia board and the middle section which is perpendicular to the lower section is continuously louvered to facilitate air inlet venting along the entire roof drip edge.

Abstract: A flooring system which has a subflooring structure that is made up of two or more layers of boards laid across each other and spaced apart from each other to create an interconnected labyrinth of void spaces in the subfloor between a finished top floor and a base, an air moving device for moving air through the labyrinth to ventilate the subfloor structure and thereby reduce potentials for damage to the flooring system due to moisture build-up under the finished floor, and a humidistat positioned in the labyrinth of void spaces to detect moisture build-up and to activate the air moving device.

Abstract: A flexible, insertable vent cover is formed from a flexible, resilient material. The cover has a through passageway; a gas-permeable, liquid-impermeable membrane traversing the passageway; a diaphragm valve covering the membrane; and an annular securing ring that maintains the valve in a protective position with respect to the membrane in order to protect the membrane from immersion in or impingement by liquid.