Get Sample Worksheets For Residential Air And Duct Leakage Testing

0.40 CFM/ft2 = Standard Practice 2021 International Energy Conservation Code (IECC) requires building thermal envelope testing in ance with ASTM E779, ANSI/RESNET/ICC 380, ASTM E3158, or ASTM E1827 such that the measured air leakage shall not exceed 0.40 CFM75/ft2.

ASHRAE Standard 90.13 (section 6.4. 4.2. 2) requires air leakage testing of 100% of all outside ductwork and 25% of representative sections of all other ductwork designed to operate at a static pressure in excess of 3- inch water gauge.

2. Specifying air leakage rates not to exceed 5% (sometimes as low as 2.5%) of system design air quantity with test pressures equal to duct design pressure class, and 3.

How to Calculate Duct Leakage? First, determine the duct design flow (CFM). Next, determine the allowable leakage percent (%). Next, gather the formula from above = DL = DF * AL / 100. Finally, calculate the Duct Leakage.

There are two main types of air duct leakage tests, LTO and TDL. LTO stands for “leakage to outside.” This type of test measures only the amount of leakage you have going into unconditioned spaces like un-insulated attics and similar areas.

ing to the EPA, the typical home with a forced air HVAC system loses between 20 and 30 percent of its conditioned air due to duct leakage.

Percentage of System Volume Flow A percentage of volume flow is also a simple calculation for the testing contractor. For example, suppose you have a duct system where the duct system is handling 14,000 cfm. If the allowable leakage is specified as 2%, then the allowable leakage is 0.02 x 14,000, or 280 cfm.

The ENERGY STAR Version 3 Rev 11 air leakage criteria specify that duct air leakage must be ≤ 4 CFM25 per 100 ft2 of conditioned floor area or ≤ 40 CFM25, whichever is greater, at rough-in or ≤ 8 CFM25 per 100 ft2 of conditioned floor area or ≤ 80 CFM25, whichever is greater, at final.