Hooded exhaust vent

Details Hooded exhaust vent Hooded exhaust vent

1990-07-13

1991-09-10

Joyce, Harold

Fluid handling

Flow affected by fluid contact, energy field or coanda effect

Means to regulate or vary operation of device

1375726, F24F 1310

Patent

active

050464086

ABSTRACT:
An air venting apparatus for use with air discharging blowers, fans, including an air outlet duct and flap valve which pivots at top of a hood. The flap valve closes the outlet end of the duct by gravity. One leaf spring clip which acts on the valve flap to retain the same in the closed position. The spring clip maintains enough force to retain the valve flap in the closed position against pressure differentials developed by the outside wind, but is fabricated to allow opening of the valve flap against pressure differentials developed by the air discharge blower (fan).

REFERENCES:
patent: 93294 (1869-08-01), Frisbie
patent: 586618 (1897-07-01), Noll
patent: 735912 (1903-08-01), Schrotz
patent: 2224494 (1940-12-01), White
patent: 2741972 (1956-04-01), Pryne
patent: 2800853 (1957-07-01), Spear
patent: 3250206, Strouth
patent: 3791281 (1974-02-01), Steiner

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