Air duct closure system

Details Air duct closure system Air duct closure system

1991-12-24

1993-08-10

Joyce, Harold

Ventilation

Having inlet airway

Including specific air distributor

454258, F24F 1308

Patent

active

052343740

ABSTRACT:
An inflatable bag of flimsy plastic material is placed in the air duct of a house or other building. The bag is coupled to a fan and electric motor. The device is placed near the duct outlet register, where it can be easily inserted and retrieved. The motor is operated, to inflate/deflate the bag, by a thermostat in the room via radio connection between the thermostat and the motor. When the bag is deflated, the duct is open, and treated air from a central unit can then enter the room. The bag takes air from inside the duct, and static pressure inside the duct holds the bag inflated; when the bag is deflated, the air intake faces away from velocity of the flowing air, so the flowing air does not tend to inflate the bag. The fan motor is driven by a battery.

REFERENCES:
patent: 3125286 (1964-03-01), Sanders
patent: 3276481 (1966-10-01), McNulty
patent: 3434409 (1969-03-01), Fragnito
patent: 3593645 (1971-07-01), Day et al.
patent: 3990464 (1976-11-01), Jenkins
patent: 4662269 (1987-05-01), Tartaglino
patent: 4762115 (1988-08-01), Penner
patent: 4852851 (1989-08-01), Webster

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