Air Duct Leakage Test Procedure

Test proceduretest procedure 1 select duct section for testing 2 measure and calculate duct surface area 3 pg p seal all openings except one.

Air duct leakage test procedure.

Quote fromquote from hvac air duct leakage testhvac air duct leakage test manual smacna. The above test procedure describes how to determine total duct leakage or how much leakage there is. Measuring air leakage at multiple induced pressures differences as described in section 802 6 802 1 3 repeated single point test. Another form of duct leakage to outside uses a blower door to measure the total amount of.

Ducts shall be pressure tested to determine air leakage by either of the following. Conduct multi zone pressurization leakage test. A third test method. Ductwork that is designed to operate at static pressures in excess of 3 inches water column 0 75 kpa and all ductwork located outdoors shall be leak tested according to the ansi smacna hvac air duct leakage test manual.

Use a calibrated fan to pressurize the duct system. Figure 5 1l from the 2012 smacna hvac air duct leakage test manual shows the allowable leakage as a function of duct leakage classification and static pressure in the duct. Measuring air leakage one time at a single pressure difference as described in section 802 5 802 1 2 multi point test. Total leakage measured with a pressure differential of 0 1 inch w g.

Total leakage measured with a pressure differential of 0 1 inch w g. There are three acceptable airtightness test procedures. 25 pa across the system including manufacturer s air handler enclosure all registers taped or otherwise sealed post construction test. Additional methods leakage to outside.

The basic idea behind using a duct leakage tester to test for duct leakage is. 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 hvac air duct leakage test manual provides practical and detailed procedures for conducting leakage tests. 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.

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. 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. Representative sections totaling no less than 25. Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.