Seasonal attic turbine ventilator

Details Seasonal attic turbine ventilator Seasonal attic turbine ventilator

1992-01-13

1993-02-02

Joyce, Harold

Ventilation

Chimney or stack

Chimneytop or stacktop structure

454 30, F24F 702

Patent

active

051834359

ABSTRACT:
An improvement is provided in a roof-mounted turbine-type ventilation fan and associated air-handling duct whereby rotation of the fan is stopped and the duct is closed during periods of cold weather. Stoppage of rotation of the fan is achieved by an elongated locking pin that penetrates aligned apertures in an annular lower rim of the fan and in a bearing collar located atop the duct and normally slidably interactive with the annular lower rim. Closure of the duct is achieved by a circular butterfly damper panel positioned within the duct.

REFERENCES:
patent: 1133969 (1915-03-01), Johnston
patent: 2923225 (1960-02-01), Massey
patent: 3952638 (1976-04-01), Felter et al.
patent: 4047682 (1977-09-01), Brownhill
patent: 4231288 (1980-11-01), Finley
patent: 4924760 (1990-05-01), Jobson
patent: 4962783 (1990-10-01), Ball et al.
patent: 4964431 (1990-10-01), Ball et al.
patent: 4967997 (1990-11-01), Hines et al.
patent: 4969485 (1990-11-01), Ball et al.

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