Access door for ductwork

Details Access door for ductwork Access door for ductwork

1991-05-10

1992-11-24

Kannan, Philip C.

Movable or removable closures

Removable closure

49466, 49506, 138 92, 220327, E06B 332

Patent

active

051651890

ABSTRACT:
An access door assembly for allowing access to the interior of a duct, including a mounting and support frame mounted at a selected location on the duct where an access port previously has been created in the duct, a cover releasably secured to the mounting and support frame by securing means, and a seal interposed between the cover and the mounting and support frame to prevent communication between the interior of the duct and the ambient when the cover is mounted on the frame.

REFERENCES:
patent: 624715 (1899-05-01), Wenz
patent: 1456601 (1923-05-01), Johnson, Jr. et al.
patent: 3654379 (1972-04-01), Rodgers
patent: 4233697 (1980-11-01), Cornwall
patent: 4530443 (1985-07-01), Gorges
patent: 4643878 (1987-02-01), Seiter et al.
patent: 4913127 (1990-04-01), Dugger

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