Ventilating heater
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United States of America Patent
Stats
-
Oct 1, 1991
Grant Date -
N/A
app pub date -
Jun 27, 1990
filing date -
Jun 27, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
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