Hvac Air Duct Leakage Test

Hvac air duct leakage test manual order no.

Hvac air duct leakage test.

A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating ventilating and air conditioning hvac ductwork. A duct leakage tester consists of a calibrated fan for measuring an air flow rate and a pressure sensing device to measure the pressure created by the fan flow. The hvac air duct leakage test manual provides practical and detailed procedures for conducting leakage tests. Potential accuracy of flow measurements should be evaluated.

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. So once you ve measured the amount of air moving through the fan you ve quantified the duct leakage at the test pressure. This means that when we measure say 120 cubic feet per minute of duct leakage at 25. Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.

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. For duct leakage testing the standard pressure used is 25 pascals which is close to the operating pressure of a typical duct system. 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.