Abstract: A flap valve vent hood for discharging air to atmosphere from clothes dryers and bathroom vents is provided freeze-free by a secondary valve that is mounted on the principal flap valve and covering an open area that provides a secondary air flow path through the principal flap valve. The principal flap valve and the secondary valve are normally closed and the principal flap valve is biased to its closed position by gravity. A lip along an edge of the open area may be provided to minimize accumulation of moisture where the two valves are in contact with one another. A soffit vent hood of particular construction is provided in which there are two members detachably interconnected one being a downwardly directed hood and the other an insert therefor which carries the valves for respective ones of a pair of outlet discharge openings.

Abstract: A roof vent (8) comprises a conduit having an open entry end adapted for being arranged in sealing communication with an aperture in a roof surface, and an exit end spaced from said entry end, shield means (31) adapted for preventing entry of rain into said conduit, a valve assembly for controlling flow of air or gas, said valve assembly comprising a valve member (13, 22) adapted for opening to passage of air or gas when the pressure at the entry end exceeds the pressure at the exit end and adapted for closing on other conditions to prevent back-flow of air or gas, and thermostat means (27) adapted for opening said valve member to bidirectional passage of air or gas when the temperature at said thermostat means exceeds a predetermined level.

Abstract: An outdoor exhaust's end of part of an indoor building system requiring an exhaust duct to evacuate air or other kinds of smoke or gases to the building's outside. The exhaust's end comprising a double enclosure that prevents the outdoor air from comming into the building by the exhaust duct and captures an air chamber in a rotary inner cylinder, which act like a thermal insulation between the inlet and the outlet of the exhaust's end. A trap located on the rotary inner cylinder is activated by the exhaust flow, that comes upward and rotate the inner cylinder, permitting to the exhaust flow to past through an opening located under the trap, to come in the cylinder and flow out by a second opening. The exhaust flow out by the outlet downward duct, that protect the exhaust's end against rain or snow without restricting the flow.

Abstract: An exhaust vent guard for protecting the exit area of an air vent conduit includes an upper hood portion and integrally therewith a lower cage portion. The upper hood portion includes a top wall, a pair of sidewalls, and a front wall, which collectively provide a weather barrier to prevent the entry of rain, snow, and other debris into the air vent conduit. The lower cage portion includes a bottom wall, a pair of sidewalls, and a front wall, each of which are constructed and arranged with a plurality of openings for permitting the free flow of air through the lower cage portion while at the same time being small enough to prevent the nesting of birds inside of the exhaust vent guard. In a related embodiment, a similarly configured exhaust vent guard is used in combination with a vent frame and a pair of flow-control louvers which are pivotally mounted into the vent frame.

Abstract: A latch for use with a valve on the end of an exhaust vent typically associated with a clothes dryer or the like. The latch includes a flat, plastic bonded magnet having a layer of pressure sensitive adhesive (PSA) for bonding the magnet to one of either the hinged valve plate or stationary face plate of the valve while a strike plate formed of a conformable, magnetically susceptible material is bonded by a PSA layer to an opposing section of the other of the valve plate or face plate. The latch is kept closed by magnetic forces in the absence of blower expelled air, regardless of variations in pressure on the valve plate, such as may result from gusts of wind.

Abstract: A forced air vent for allowing the unidirectional outflow of exhaust air from the interior of a structure into the atmosphere by way of an eave opening includes a generally rectangular main body, arranged with a perforate bottom wall and a pair of oppositely disposed side walls and two hingedly connected movable internal baffle plates. An interior space is defined by the bottom wall and the two oppositely disposed side walls. The perforate bottom wall is arranged with a solid central portion and two oppositely-disposed distal portions. A corresponding abutment ledge is disposed between each distal portion and the central portion. Each distal portion includes a grate panel through which air can freely pass. From a closed position, the baffle plates are movable outwardly and upwardly into an opened position in response to positive air pressure from within the attic interior. The bottom wall has a convex surface protruding into the central portion to focus the air flow onto the baffle plates.

Abstract: A ventilator having a one-piece plastic base with integral tubular member having a through passageway for flow of an exhaust gas stream. The tubular member is preferably molded simultaneously with the base, rather than glued, so that the base and tubular member assembly comprise not only a sealed tubular member, but provide a single, seamless part. Thus, moist air cannot leak out of the air flow path between the interior and exterior of a wall or roof. The ventilator is also provided with a screen and a flapper type lid for the tubular member. The flapper lid seals the outer end of the tubular member against inflow of outside air at those times when there is no exhaust gas stream impinging against the flapper so as to keep the flapper in the open position. The ventilator may be provided in a variety of colors by pigmentation of the plastic to be molded into the ventilator.

Abstract: An extensible-contractible duct connector of slidingly interfittable, elongated, partial duct elements, the partial duct elements having an open end telescopically interfit with an open end of the other partial duct element to cooperatively form a duct connector, each having an outer closed end, each partial duct element having a side air flow opening directly adjacent the respective one of the closed ends to prevent significant dead air space between the opening and the adjacent closed end, the partial duct elements having slidably interfitting lateral edges with each other enabling sliding telescopic interfit that is incrementally variably adjustable between an extended condition with the side air flow openings offset maximally from each other, and a contracted condition with the side air flow openings having zero offset from each other.

Abstract: A telescopically extensible-contractible air duct connector comprising an elongated outer duct element having an open end, a closed end, and a lateral opening adjacent the closed end, an inner duct element telescopically interfitting within the outer duct element, having an open end within the outer duct element, a closed end located outside the outer duct element, a lateral opening adjacent the closed end, and a laterally projecting sleeve around the lateral opening, the outer duct element having an elongated slot extending from the open end and of a width slightly greater than that of the laterally projecting sleeve of the inner duct element to receive the sleeve upon telescopic contraction of the connector, and the inner duct element having an extended panel within the outer duct element, adjacent the slot, and of a width greater than the width of the slot to cover the slot when the connector is at least partially extended.

Abstract: A vent guard that keeps birds out. This vent guard is designed with round, smooth bars which do not hold lint from dryers. The bars dropped down lower than the frame design allows wind to keep it clean.Present materials used to fashion the vent guard are polypropolene and polyethylene, with ultraviolet ray blockers.

Abstract: A ventilating device covers an opening in a structure and includes longitudinally-extending compartments, each of the compartments having longitudinally-extending side walls. A baffle is placed in the compartments, and is otherwise unattached to the ventilating device. The baffle is movable from an inactive position permitting communication through the ventilating device to an active position closing off communication to thereby prevent wind-driven moisture from being driven into the ventilating device.

Abstract: An exhaust vent cover for closing the exhaust vent when the exhaust vent is not in use is shown. The exhaust vent cover includes a peripheral flange for attaching the cover to a surface and a continuous hollow body extending upwardly from the flange and having an open front as well as an air passageway communicating with this open front. The continuous hollow body further includes an overhang extending beyond the open front, a grill covering the open front to prevent access to the inside of the continuous hollow body, and a valve located inside the hollow body across the air passageway. The exhaust vent cover also includes a sloped upper surface to prevent the valve from being blown open.

Abstract: A wall connector for connecting a clothes dryer air outflow duct to outside ambiant air through a building external wall. The connector includes: a rigid tubular main body, extending through and mounted into an aperture in the building wall; an inner end portion, sized to fit about the dryer air duct outer end mouthpiece in substantially air-tight fashion; and an outer end portion, of double wall construction, wherein a peripheral cavity is formed thicknesswisely of said main body, the peripheral cavity defining an end mouth opening to outside ambiant air. A hood fits against the exterior face of the building wall, and includes: an inner tubular section, releasably engaging through the peripheral cavity of the connector main body, and louvers, for preventing air inflow from ambiant air into the connector main body.

Abstract: An outlet protector auxiliary, for a vent duct which leads exhaust substance from equipment, such as lint and moisture from a clothes dryer, for venting discharge exteriorly of a building's wall, the vent duct outlet having a movable closure flap which has a substance-discharge position and a closed position. The auxiliary is in the form of a metal framework providing a cage-like body member, having enclosure panels having openings of a restricted size such as to permit discharge of exhaust through the openings but to block entry into the duct, from the wall's exterior, of matter of any size significantly larger than the particles of exhaust substance for which the auxiliary is provided; and the cage-like body member has a peripheral flange by which it is connected to the wall.

Abstract: Valve (10) comprising a housing (20) with an air inlet (23) mounted at the end of a discharge air duct of a domestic appliance, and with an air outlet (24) communicating with the outside. The valve (10) includes a shoulder (41) sealed to the air inlet (23). A ball (42) is received in the housing (20) and is movable on a guide (43 between first and second positions. When there is no airflow from the duct (60), the ball sealingly engages the shoulder (41) under gravity so as to prevent air from being introduced into the duct from outside through gusts of wind. The shoulder (41) and the ball (42) can be made from an insulating material in order to reduce conductive heat loss in cold weather. When the domestic appliance is operating, the ball (42) moves towards the second position under the discharge airflow in order to evacuate said airflow. As soon as the appliance is stopped, the ball (42) resumes automatically its initial position.

Abstract: An eave vent for discharge of gases from a dwelling, comprising a housing having a lower horizontal peripheral mounting rim having fastener receiving openings therein, and defining an air flow outlet from the housing, a vertical wall normal to the rim and having a top portion, a hose connector extending from the vertical wall and defining a gas flow inlet to the housing, a diagonal wall having a juncture with and at an angle of about 45.degree. to the vertical wall top portion, to the horizontal rim, and a pair of triangular opposite end walls joining the vertical wall, the horizontal rim and the diagonal wall to enclose the housing, and a rectangular closure flapper pivotally mounted on a horizontal axis at the juncture, depending over the air flow outlet, pivotal out against the diagonal wall with air flow out the outlet to lie flush against the diagonal wall, and pivotal against the vertical wall under reverse air flow.

Abstract: A vent structure that acts as a combination masonry guide and lintel. The flat interior portion has flanged sides and a bottom disposed perpendicular to the interior plate. An opening is provided in the interior plate so a vent pipe can pass therethrough. The upper flange is the same size as a masonry lintel and is longer than and overhangs the side flanges. The structure is preferably integrally formed from plastic or metal. An exterior protective closure is mounted on the masonry guide once the building structure has been completed. The closure mounts on the vent pipe and will open when air or other fluids are passing from the vent pipe and will automatically close when the flow ceases.

Abstract: An exhaust box used to ventilate rooms or devices within a building to the ambient environment. The exhaust box has a generally rectangular main body portion, with an exterior end and an interior end and is adapted for installation in the wall structure of the building. An inlet portion projects from the interior end and is adapted to receive an exhaust duct in sealed relation thereto. A flange portion extending radially outwardly from the exterior end of the main body portion helps retain the exhaust box in place within the wall structure. The main body portion has a bottom portion that is sloped downwardly towards the exterior end so as to cause water to flow towards the exterior thereof. A damper member is pivotally attached to the exhaust box so as to be gravity biased into place against a receiving surface at the interior end of the inlet portion.

Abstract: A roof vent for a grain bin communicates air flow from within the grain bin to ambient air, especially when air is forced through the bin for the purpose of drying the grain therein. The vent includes a housing with a flap closure member in the shape of an airfoil pivotally mounted on a horizontal axis above the center of gravity of the flap member. When sufficient air pressure is developed within the bin, the force of gravity on the flap member is overcome and the flap member pivots to an open position. As air flows over and under the flap member, the airfoil shape of the flap member creates a decreased pressure over the member and a lift force causes the flap member to position itself in an open position with minimal obstruction to air flow through the vent housing providing many operational advantages.

Abstract: A flow control has a rotary gate residing within an internal flow space in a conduit. The gate is mounted for movement relative to the conduit between first and second positions, the gate in the first and second positions accounting for a different flow rate between first and second fluid masses between which the gate resides. The gate has an actuator with a plurality of spaced shoulders. A flexible force-applying member is connected to the actuator and bears upon the shoulders to thereby urge the gate towards the other of the first and second positions. The shoulders are situated so that the number of shoulders engaged by the force-applying member at any one time is not the same as the gate moves from the one of the first and second positions towards the other of the first and second positions.

Abstract: A dual coupler assembly to be mounted to the back wall of an automatic clothes drying machine for use with the flexible hose fluidingly connecting the air outlet port of the drying machine to outside ambient air. A first coupler includes a cylindrical flue releasably anchored to the drying machine back wall, while a second coupler includes a cylindrical flue anchored to the laundry room floor; in one embodiment, the flues are both horizontal, while in a second embodiment, the flues are vertical. In a third embodiment, one hose coupler is slidable along a ground rail integral to the second hose coupler, the latter being fixed to the ground; an operative position is defined, where the cylindrical flues of the two hose couplers become coaxial to one another. In all cases, by displacing the dryer towards the second coupler, the latter will engage edgewisely the first coupler to become coaxial therewith, wherein fluid-through communication is established.

Abstract: A protective cover device for a wall fan includes a shutter assembly having a first ring plate, a second ring plate with a shape similar to that of the first ring plate, and a plurality of arcuate strips provided between the first and second ring plates. The first and second ring plates define a central opening. Each arcuate strip has a shape corresponding to an arc portion of the first and second ring plates. One end of each arcuate strip is connected to the first ring plate. The other end of each arcuate strip is connected to the second ring plate. The arcuate strips are evenly distributed on the first and second ring plates to form an overlapping arrangement between the first and second ring plates.

Abstract: A control apparatus or system for purged and pressurized electrical equipment provides rapid, controlled exchange of pressurizing or purging gas to an electrical enclosure. The control system or apparatus for NFPA Type Y and Type Z electrical equipment enclosures has a source of pressurizing gas, a rapid exchange pressure control filter/regulator, rapid exchange pressure gauge, vent control valve and a manual inlet valve providing for rapid exchange of purging gas to the electrical enclosure during start up, an enclosure control valve, enclosure pressure indicator, a venturi providing controlled leakage from the system, and a pressure loss control alarm or switch.

Abstract: A cap which can be attached to a roof vent pipe to form a closure for the roof vent pipe after the usual ventilating device attached to the roof vent pipe has been removed thereby trapping hot air in the attic area of a home or other building. The roof vent cap is of one-piece unitary construction secured in place by anchoring screws which may be the same screws that secure the roof ventilator in place with the cap including three depending cylindrical flanges of different lengths which can be mounted on different diameter roof vent pipes thereby rendering the cap universal in use. The variation in length enables access to anchor screws on each of the flanges.

Abstract: An automatic ventilator closure is described which operates on the basis of an over-pressure within the conduit leading up to the ventilator outlet. Electrical interlocks control a motor to place the closure in an open or closed condition.

Abstract: A passive building vent disposed in an outside vertical building wall, communicates between the outside atmospheric air and the confined air within the building, via a housing forming an air mixing chamber with a passageway disposed therethrough. A movable membrane is mounted within the housing at one end of the passageway, the other end of the passageway communicates with the confined air and is disposed outside of the vertical building wall. The membrane has a closed position, substantially blocking the passageway and an open position, permitting the free flow of air therethrough. The air passage permits the flow of outside air into the air mixing chamber. A venting device communicates with the air mixing chamber permitting the flow of air to exit from the air mixing chamber. A deflector is mounted on the housing proximate the venting device and communicates with the air mixing chamber.

Abstract: An automatic ventilator closure is described which operates on the basis of an over-pressure within the conduit leading up to the ventilator outlet. Electrical interlocks control a motor to place the closure in an open or closed condition.