Abstract:
An air circulation system is provided for a building having a plurality of zones to be heated, ventilated or cooled. The system includes an air circulating apparatus arranged to supply either heated, cooled or ventilated supply air to the various zones of the building via a plurality of supply ducts. The apparatus also draws return air from the zones via a plurality of return ducts. A damper is coupled to both the supply and return ducts of each zone, adjacent the air circulating apparatus, to balance the amount of supply and return air in each zone for reducing mixing of air between zones and stratification within a zone. Accurate and independent control of each zone in relation to the other zones in the building is thus permitted. The circular ducts are formed of sealed PVC or other suitable plastic material to improve the efficiency of the air delivery system both by reducing pressure losses and temperature losses conducted through the walls of the ducts.
Abstract:
A security vent includes a housing, a drawer and a latch. The housing includes first and second ends defining a passageway in which the drawers receive. The drawer includes a filter receiving slot. The drawer is movable in and out of the passageway to provide access to the filter receiving slot such that a filter can be inserted and removed therefrom. The latch assembly allows the drawer to be locked in a closed position and unlocked for opening. In another embodiment of the invention, a security vent mountable to the existing air duct inlet opening includes a housing assembly having a mounting frame and a housing wall secured to the mounting frame. The housing wall includes a front faced space from the mounting frame. The front face is perforated. The housing wall and mounting frame define a filter receiving region for holding an air filter. A door is secured to the housing wall and may be moved between an open position and a closed position to either permit or prevent access to and from the filter receiving region. The vent further includes a latch assembly for locking the door in a closed position. In another embodiment of the invention, a system for ventilating an enclosed region includes a secure vent affixed to the wall of the region, the vent including a removable filter. An access door is provided and is movable between a closed position and an open position to either permit or prevent access to the filter.
Abstract:
A disinfectant distribution system for heating and cooling ducts for purifying the air handled by a central forced-air heating or cooling system. The disinfectant distribution system for heating and cooling ducts includes a housing structure assembly including a housing having a front wall, a back wall, side walls, and a top wall, and being adapted to be securely attached to a heating and cooling duct; and also includes a conduit assembly being attached to and extended in the housing for transporting disinfectant spray from an aerosol can to the heating and cooling duct; and further includes a spray dispensing assembly being disposed in the housing and being adapted to dispense disinfectant spray from the aerosol can.
Abstract:
An insulated air duct apparatus including insulated duct modules and associated insulated fitting apparatus for transferring a volume of fluid in a warm air heating and air conditioning installation without employing external insulation or structural support members, otherwise required to support and insulate duct apparatus including a plurality of lightweight duct modules in combination with take-off connectors for joining such modules, each duct module comprising duct walls joined by corner members wherein said duct walls and take-off connectors comprise rigid fibrous glass (RFGB) with reinforced facing having inherent structural strength such that each duct module is self supporting.
Abstract:
A tie rod for reinforcing heating, ventilating and air conditioning (HVAC) ducts against excessive wall flexure in response to positive and/or negative static or dynamic pressure differentials between the interior and exterior of the duct includes a threaded steel rod having a pair of abutment structures irrotatably fastened to longitudinally opposed end portions of the rod. Each abutment structure has a central coaxial bore which receives the rod, and includes a tubular portion terminated at an outer longitudinal end thereof by a transversely disposed, radially outwardly protruding annular flange. The bore wall of the abutment structure's tubular portion flares in an arcuate curve radially and axially outwardly to join the outer transverse wall surface of the flange, forming a tapered annular cavity between the bore wall and the end portion of the threaded rod protruding out from the abutment structures. An O-ring is slipped over each end portion of the threaded rod, the rod placed within a duct, and opposed ends of the rod inserted into respective ones of a pair of perpendicularly aligned perforations provided through opposed walls of the duct. A separate one of a pair of flare nuts is then tightened down onto the outer surface of each duct wall, compressing the O-ring between the inner surface of the duct wall and the outer transverse flange wall of the abutment structure, thus causing the O-ring to cold flow partially into the tapered annular cavity, and thereby forming a highly effective hermetic seal of each duct wall perforation.
Abstract:
In a method of producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically wound together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.
Abstract:
In an apparatus for producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically wound together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.
Abstract:
In a method of producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically would together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.
Abstract:
The object of the invention is to provide a new installation for fighting fire, which is effective in restricting damages caused by smoke generation. A sprinkler (6) or a spray head is arranged in or at an air passage (7) in such a way that when the spinkler is activated it creates a suction from the fire space (1) into the air passage.
Abstract:
A method of protecting vent hoods and exhaust ductwork from buildup of grease and grime comprising coating the vent hoods and exhaust ductwork with a thin coating of a grease repelling removable non-hygroscopic composition.