The units of measure for the Air Infiltration Value field.
Air Infiltration Value Units
|List Options||Option Definition||Unit of Measure||Source|
|ACH||Air changes per hour||ACH|
|ACH50||Air changes per hour at 50 Pascals (Pa) pressure||ACH|
|ACHnatural||Air changes per hour at natural air leakage rate||ACH|
|CFM||Cubic feet per minute||cfm|
|CFM25||Cubic feet per minute at 25 Pascals (Pa)||cfm|
|CFM50||Cubic feet per minute at 50 Pascals (Pa)||cfm|
|CFM75||Cubic feet per minute at 75 Pascals (Pa)||cfm|
|CFMnatural||Cubic feet per minute at natural pressure||cfm|
|Effective Leakage Area||Total area of all the gaps and cracks in a premises which contribute to infiltration. It is usually calculated in the U.S. at 4 pascals||in2|
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