Ventilation fan control
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United States of America Patent
Stats
-
Nov 15, 1994
Grant Date -
N/A
app pub date -
Nov 14, 1991
filing date -
Nov 14, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The residential structure ventilating apparatus disclosed herein employs a variable speed exhaust fan. The speed is responsive to a sensor which detects air temperature at the exhaust port. The fan is energized when the sensed air temperature rises above a first preselectable temperature and the external environmental air is cooler that the air at the exhaust port. The fan speed is increased progressively from about one-half full speed at the preselected turn on temperature to full speed at a predetermined higher temperature. The fan is turned off when the exhaust port temperature falls below a second preselected temperature, lower than the first preselected temperature or when the external environmental temperature rises above the inside temperature, the fan speed being essentially constant between the first and second preselected temperatures.
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