Duct Air Leak Test Procedure

Another form of duct leakage to outside uses a blower door to measure the total amount of.

Duct air leak test procedure.

Use a calibrated fan to pressurize the duct system. To find the total duct leakage that s basically all you do. First you need to determine if a duct leakage test is required. For more information see the real zero guide to the 13 most common leaks.

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. Conduct multi zone pressurization leakage test. If the system is short of refrigerant decant the remainder of the charge and replace the line tap with a schrader before re processing the system. Total duct leakage test in the previous page on the basic duct leakage testing procedure we said that you pressurize the duct system and measure the airflow through the fan.

1 blower with speed control vfd to generate range of pressure flowrange of pressure flow 2 flow measuring devices flow grid flow station high flow flow grid flow station high flow orifice plate low flow. Use the line tap to access the system to diagnose problem. 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. Measure the airflow through the fan with the duct system at pressure.

The only time duct testing is required is when parts of the hvac system are outside of the conditioned envelope. The hvac air duct leakage test manual provides practical and detailed procedures for conducting leakage tests. Ensure all valves are capped. This includes areas like unconditioned attics garages and crawlspaces.

Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required. 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. Test apparatustest apparatus duct leakage test system consists of duct leakage test system consists of.

If any supply or return duct chases flexible lines or air handler units are in these areas by iecc 2015 code a duct leakage test is required. Additional methods leakage to outside. Potential accuracy of flow measurements should be evaluated. The above test procedure describes how to determine total duct leakage or how much leakage there is.