Pressure differential indicator with fire damper
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United States of America Patent
Stats
-
Aug 4, 1998
Grant Date -
N/A
app pub date -
Dec 6, 1996
filing date -
Dec 6, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pressure differential indicating apparatus has a wall duct with first and second ends, first and second flange like mounting plates respectively disposed around and attached to the first and second ends, a low speed airflow indicator mounted at one of the ends on a side of the mounting plate opposite that to which the wall duct is mounted, and a fire damper with a closable fire damping door that is disposed in the duct. The fire damper includes an actuation device for keeping the door open until the actuation device is caused to close the door. One particular embodiment of the actuation apparatus has a spring counter loaded solenoid that keeps the door open when energized and a spring operably connected to the solenoid so as to close the door when the solenoid is de-energized. An alarm system may be used for detecting smoke/fire and controlling a voltage supply line connected to the solenoid may be used to energize the solenoid and includes power cutoff apparatus for cutting off voltage to the supply line to de-energize the solenoid and close the fire damping door that is disposed in the duct.
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