Rectangular flexible duct

Details Rectangular flexible duct Rectangular flexible duct

1990-06-27

1992-02-04

Chilcot, Jr., Richard E.

Pipes and tubular conduits

Flexible

With means for facilitating collapse

138121, 138128, 138157, 138173, F16L 1111

Patent

active

050852515

ABSTRACT:
A rectangular, flexible duct serves as an alternative to galvanized sheet metal duct work installed in homes by utilizing corrugated semi-rigid top and bottom walls with relatively flexible connecting side walls so that the duct may be easily rolled and stored. But when unrolled, it is fastened, for example, between floor joists of a home by use of an overhanging flange formed by one of the top or bottom walls. The duct walls are made of heat resistant plastic suitable for heating and ventilating. Rigidity is provided in the top and bottom walls by corrugations or ribs formed in the plastic.

REFERENCES:
patent: 2821896 (1952-07-01), Kice et al.
patent: 3811633 (1974-05-01), Cummings et al.
patent: 3818948 (1974-06-01), Hedges

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