Total leakage measured with a pressure differential of 0 1 inch w g.
Hvac duct leakage test results.
Crisis spiral ductwork with leakage rates of less than 1 percent may again have to be considered for pressures of 1 inch to 10 inch wg.
Duct leakage test system consists of duct leakage test system consists of.
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.
1 blower with speed control vfd to generate range of pressure flowrange of pressure flow.
Ducts shall be pressure tested to determine air leakage by either of the following.
Total leakage measured with a pressure differential of 0 1 inch w g.
A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating ventilating and air conditioning hvac ductwork.
Though built tough with an on board powerful motor the dalt 6900 is very easy to transport on its pneumatic tires and leaves little to no footprint on the job site.
Irc 2015 n1103 3 4 allows the following duct leakage.
25 pa across the system including manufacturer s air handler enclosure all registers taped or otherwise sealed post construction test.
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.
Ashrae 90 1 recommends only testing ductwork rated 3 in h 2 don t test flex duct.
They did not test the drier vent ducts or erv ducts because their leakage rate would be too small to measure they said.
How to test duct leakage b i basic.
The instrument provides step by step test configuration and automated leakage testing based on the smacna hvac air duct leakage test manual and is accurate to 2 5 of reading.
Duct leakage test results rough in test air handler not installed total leakage 4 cfm per 100 ft2 of conditioned floor area tested at a pressure differential 25pa 0 1 in w g across roughed in system all register boots taped or otherwise sealed.
Rough in test less than 4 cfm per 100 sq ft which for my house is about 160 cfm if the air handler is included in the leakage test.
The duct air leakage testing equipment shall be attached to the largest return in the system or to the air handler.
Block if present the ventilation air duct connected to the conditioning system.
Leakage test procedures shall follow the outlines and classifications in the smacna hvac duct leakage test manual.
Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.
Table 3 is an abridged version of appendix e from the smacna hvac duct leak test manual that quantifi es the amount of leakage by pressure for each duct class.
