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2000 Fire Door-Fan Manual updated 2002-05-28 Page 19 of 58
Smoke test & measure static pressure
The purpose of this test is to see whether there is a static pressure in the room prior to the
door fan test. The door fan is not running and smoke is puffed in front of an open hole in the
blower. If it moves slowly or not at all, no pressure exists. Minor pressures are cancelled out
by testing both directions so we are therefore looking for significant movement of 2 mph
(3kph). If the zone outside the enclosure is not completely connected with open doorways
then you must check across each wall this is not connected. Walls to outdoors can be ignored.
If there IS smoke movement, the magnitude of the pressure must be measured with the room
gauge or the handheld gauge.
See section called: “Smoke test & measure static pressure for more information.”
Check to see if there is any static
pressure by puffing smoke near a
known hole at the door. If the
smoke moves, the next step is to
measure the magnitude since the
smoke is the best guide to its
direction.
If the smoke moves, a
handheld gauge or room
gauge with tube under
doorway is used to
measure the static
pressure.
Analog handheld gauge
must be held firmly against
a vertical surface to ensure
zero shift is kept to a
minimum.