Ventilation – Having outlet airway – With air pump
Patent
1993-03-23
1994-07-19
Joyce, Harold
Ventilation
Having outlet airway
With air pump
454339, 454354, 454358, F24F 7007, F24F 1318
Patent
active
053303865
ABSTRACT:
A method of installing a ventilation device through existing plywood door closures of accesses to attic spaces with roof fans in homes includes a frame with louvers across a central opening closed by two doors hingeably attached to be opened and closed with a hook rod interconnecting with eye bolts on the doors, the entire device being insulated to reduce heat loss during the cooler seasons.
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patent: 4628802 (1986-12-01), Steiner et al.
patent: 4770087 (1988-09-01), Danley et al.
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Joyce Harold
Lennox Thomas A.
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