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NFRC 400

2014 Edition, 2014

Complete Document

Procedure for Determining Fenestration Product Air Leakage

Includes all amendments and changes through Change/Amendment , 2014

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Description / Abstract:

This procedure defines the criteria for testing fenestration air leakage rates to the requirements and guidelines as established by the NFRC. Many of the criteria are referenced from other ASTM standards and NFRC 100 [1]. Issues of test pressures, leakage mode, test size, and test temperatures are based on currently acceptable and recognized industry practices for air leakage testing of fenestration. Within this procedure the North American Fenestration Standard/Specification for windows, doors, and skylights (NAFS) [2, 3, 8] or the Florida Building Code Testing Application Standard (TAS) 202 [7] can alternately be used to report product air leakage provided all conditions in Section 4 are met.

This procedure is applicable to fixed and operable fenestration products.

Air leakage rates for a given fenestration product may vary depending on quality control, environmental factors (temperature, barometric, pressure, humidity, etc.), usage-stresses, operating style differences, long term durability, variable installation methods, and material/design selection. This procedure does not address any of these issues. The air leakage rates obtained from this procedure are intended primarily for product comparison purposes.


To specify a procedure for determining fenestration product air leakage.