Standard: AAMA 1503 - Voluntary Test Method for Thermal Transmittance and Condensation Resistance of Windows, Doors and Glazed Wall Sections

Scope: This test is applicable to both residential and commercial fenestration products but is primarily used in the commercial market to specify product performance.

Applicable Products: Windows, Doors, Curtain Walls

Test Procedure: The test utilizes an apparatus known as a guarded hot box. The guarded hot box consists of a cold room and a warm room. The cold room contains refrigeration coils to maintain temperatures as low as -22ºF (-30ºC) and fans to replicate wind speeds of 15 mph (24 kph). The warm room contains electric heating elements to maintain temperatures up to 100ºF (38ºC). The warm room is enclosed within a second room, known as the guard room, with the same heating capabilities.

In the AAMA 1503 test, the product is placed in a wall between the warm and cold rooms. Temperatures of 70ºF (21ºC) and 0ºF (-18ºC) and a wind speed of 15 mph (24 kph) are maintained in the two rooms until steady-state conditions have been met for temperature on both sides and energy input to the warm side. The heat flow through the product and the surface temperatures of the frame and glass are measured to determine the U-Factor and the Condensation Resistance Factor (CRF) of the product.

End Result: The thermal transmittance (U-Factor) and Condensation Resistance Factor (CRF) of the product are determined. These values are used to determine if products meet specifications for projects, energy codes, and/or voluntary programs. The U-Factor can be used to determine energy losses through products. The CRF is used to compare products and determine relative performance with regards to condensation formation on the interior surfaces of a product.

Special Notes: Alternative U-Factor methods which may be appropriate are NFRC 100, NFRC 102, CSA A440.2, ASTM C1199, and ASTM C1363. Alternative Condensation ratings which may be appropriate are NFRC 500 and CSA A440.2.


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