Determining Rate of Air Leakage through Exterior Windows under Specified Pressure Differences across the Specimen
This test method covers a standard laboratory procedure for determining the air
leakage rates of exterior windows or skylights under specified differential pressure
conditions across the specimen. The test method described is for tests with constant
temperature and humidity across the specimen. The procedure intends to measure only
leakages from the assembly and not the installation.
For this test a specimen shall be a completely assembled unit and be put into position
against or inside an air chamber where the air will be supplied or taken out of
the chamber at a rate required to maintain the specified test pressure difference
across the specimen, and measuring the resultant air flow through the specimen.
Standard items of testing can be used for this test such as a well sealed box, wall,
controllable blower, exhaust fan, etc. as long as there are no extraneous losses.
There needs to be a constant air flow over a given period of time to allow for readings
to be taken.
Before the testing starts be sure to install the specimen properly minus any packaging
or sealing material and make sure that the specimen is unobstructed. Ensure that
all locks, doors or seals are properly closed and locked. You can now start the
air flow into the air chamber and start taking down readings.