Rooftop access system

Details Rooftop access system Rooftop access system

1994-09-19

1995-12-12

Kannan, Philip C.

Movable or removable closures

Frame with closure feature

49380, 49402, E06B 104

Patent

active

054738423

ABSTRACT:
A rooftop access for an HVAC sheet metal enclosure is provided by cutting a T-shaped opening in a wall of the enclosure and inserting a frame with a door and a peripheral flange, the upper portion of which is inserted through the slot at the top of the opening. The flange upper portion includes a flashing, projecting over the frame below.

REFERENCES:
patent: 1271210 (1918-11-01), Otte
patent: 1628249 (1927-05-01), Kirfman
patent: 2282733 (1942-05-01), Malloy
patent: 2319415 (1943-05-01), Lightfoot
patent: 2793721 (1957-05-01), Sterud
patent: 3156954 (1964-11-01), Haught
patent: 3286405 (1966-11-01), Schembri
patent: 3537212 (1970-11-01), Gilles
patent: 3562955 (1971-02-01), Blomgren
patent: 3858355 (1975-01-01), Root
patent: 4555867 (1985-12-01), Stibolt
patent: 4890418 (1990-01-01), Sachs

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