2000 Fire Door-Fan Manual updated 2002-05-28 Page 29 of 58
If the gauges fluctuate more than 1 Pa due to wind, follow these steps to reduce the
fluctuations in the gauge reading.
Tip: instead of taking readings at low room pressures around 10 Pa, perform the test at 60
Pa room pressure. The effect will be to reduce the retention time slightly but overall the
test will be more accurate.
View from outdoors
Plug the red tube into the
open end to the T on the 25'
+ 50' red wind damping
tubes. The tubes are placed
away from the building to
avoid the pressure pulse
that gets created when the
wind hits the wall. Cover
the end of the tube with
sheet material or a box to
stop the wind from blowing
into the end.
A
ttach 14 ft. red tube to wind damping
system
Wind damping system
Red. Tube from panel goes here