Air Duct Leakage Test Summary

25 pa across the system including manufacturer s air handler enclosure all registers taped or otherwise sealed post construction test.

Air duct leakage test summary.

Ri trequirements us smacna hvac air duct leakagg e test manual first edition 1985 ashrae 90 1 proposed. Why test ducts for lk leakage. In a recent article which was published in rses journal smacna s senior project manager pat brooks pe discusses the history of duct air leak testing and describes proper techniques and practical applications when leak testing is performed in accordance with smacna standards. Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.

Ducts shall be pressure tested to determine air leakage by either of the following. Anything that gives off visible smoke will be a useful tool when trying to find air. 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. 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. 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. The test is similar to the single point test but the test is.

Na2 1 4 2 diagnostic duct leakage diagnostic duct leakage measurement shall be used by installers and hers raters to verify that duct. Duct tape is not actually meant to seal most ducts at least not as a permanent fix. If someone previously tried to seal up a leak using duct tape you ll want to remove this so that you can seal up the leak properly. Table na2 1 1 provides a summary of the duct leakage verification and diagnostic test protocols included in section na2 1 and the compliance criteria.

Light a smoke pencil or incense.