Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-10-12
1995-08-01
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
34030915, 454909, G08B 1710
Patent
active
054383242
ABSTRACT:
An apparatus for exhausting contaminant-laden air from a building area includes a monitoring device for determining when a contaminant level has exceeded a preselected value and which provides an output signal when the contaminant level has exceeded said preselected value, a motor-driven exhaust fan and associated conduit means for expelling air from the building area, and a timer-control circuit for actuating the exhaust fan for a predetermined period of time in response to an output signal from the monitor that the concentration of the contaminant has exceeded the preselected level. The apparatus allows for the removal of contaminants from an occupancy area of a building only when the level of the contaminant exceeds a preselected level, and only for a maximum predetermined period of time effective to reduce the amount of contaminant in the air to a safe level, thereby providing effective, energy efficient means for maintaining contaminant concentrations below a desired level.
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Chyi Lindgren L.
Quick Thomas J.
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