Ventilating heater

Details Ventilating heater Ventilating heater

1990-06-27

1991-10-01

Yeung, James C.

Stoves and furnaces

Hot-air furnaces

Compressed air

126116A, 126116R, F24H 302

Patent

active

050523678

ABSTRACT:
An easily portable ventilating heater to supply either ambient fresh air or warm fresh air to utility workers while working in an underground utility installation. The ventilating heater comprises a blower unit and a heater unit. The blower unit can be used and operated without the heater being in operation. On the other hand, the heater cannot operate unless the blower unit is in operation. The ventilating heater has seveal safety features so that the heater automatically shuts down if the heater exceeds a pre-set temperature of about 200.degree. F., the inlet air flow is interrupted or the power or gas supply is interrupted. The ventilating heater automatically restarts once the heater temperature goes below the pre-set temperature and there is no interruption of air or gas flow or power. The heater uses liquid propane gas and the electrical system can be A.C. or D.C.

REFERENCES:
patent: 2540280 (1951-02-01), Norman, Jr.
patent: 2609055 (1952-09-01), Monroe
patent: 3115130 (1963-12-01), Seymour
patent: 4390125 (1983-06-01), Rozzi
patent: 4718846 (1988-01-01), Oguri et al.
patent: 4729365 (1988-03-01), Mutchler
patent: 4941863 (1990-07-01), Chou et al.

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