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2000 Fire Door-Fan Manual updated 2002-05-28 Page 41 of 58
The Field Calibration Check is a procedure which enables the AHJ to determine that the door
fan to be used on a test is sufficiently accurate, and that the technician knows how to operate
the equipment. It is also a useful training exercise for an inexperienced operator gaining
familiarity with the equipment.
The Infiltrometer is set up to measure the BACKGROUND leakage of a small room.
Next, a hole of known size is opened up and the room is re-measured with the Infiltrometer.
The new increased leakage area reading should be the sum of the first, plus the known hole
size. The difference between the actual increase and the measured increase is the
Infiltrometer and/or the operator error, e.g.:
1. The room is measured at 200 square inches of leakage area.
2. A 144 square inch hole is opened up.
3. The new leakage area should read: 200 + 144 = 344 square inches.
4. If the Infiltrometer measures the new total leakage area at, say, 350 square inches, the
difference is 350 - 200 = 150 square inches, which is (150 - 144) = 6, 6/144 x 100% = 4.2%
error.
NFPA 12A and 2001 specifies that the door fan system has to be within + 15%.
This test should be performed from the Field Calibration tab of CA2001.