Air Duct Leakage Test Procedure

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Air duct leakage test procedure.

Conduct multi zone pressurization leakage test. Additional methods leakage to outside. With all diffusers sealed as in the first test above this new test method simultaneously investigated air leakage through all major pathways from the underfloor plenum including not only leakage to the room but also leakage to the adjacent 6thfloor and to the outside. Ducts shall be pressure tested to determine air leakage by either of the following.

The basic idea behind using a duct leakage tester to test for duct leakage is. Test proceduretest procedure 1 select duct section for testing 2 measure and calculate duct surface area 3 pg p seal all openings except one. Where no specific duct pressure. Total leakage measured with a pressure differential of 0 1 inch w g.

Measuring air leakage at multiple induced pressures differences as described in section 802 6 802 1 3 repeated single point test. Total leakage measured with a pressure differential of 0 1 inch w g. This american national standard ansi smacna 016 2012 covers revised leakage criteria and builds on the proven methods for testing ductwork for air leaks from the first edition. The above test procedure describes how to determine total duct leakage or how much leakage there is.

There are three acceptable airtightness test procedures. Measure the airflow through the fan with the duct system at pressure. Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required. 25 pa across the system including manufacturer s air handler enclosure all registers taped or otherwise sealed post construction test.

Use a calibrated fan to pressurize the duct system. Measuring air leakage one time at a single pressure difference as described in section 802 5 802 1 2 multi point test. A third test method. Contains updates to the expected leakage rates for ductwork constructed to the smacna hvac duct construction standards metal flexible duct leakage test procedures recommendations on use of leakage testing types.

Another form of duct leakage to outside uses a blower door to measure the total amount of. Representative sections totaling no less than 25. The test is. Apparent differences of about ten percent between fan delivery and sum of airflow measurements at terminals do not necessarily mean poor sealing and excess leakage.