The American Architectural Manufacturers Association (AAMA) has released “Voluntary Specification for Sash Balances” (AAMA 902-14), which establishes the requirements for the materials, testing and performance for sash balances used in hung-type windows.

It also provides rating criteria and test procedures for qualifying balances to two performance levels and six MAF Classifications.

“The original goal was to break apart the balance requirements for residential and commercial windows and have a rating system to distinguish the two,” says Gary Newman of Amesbury + Truth, chair of the Sash Balance Review Task Group.

Newman adds that windows will be tested through 5,500 cycles instead of just 4,000, as previously required. “The MAF requirement is now checked both before and after the cycle testing for the A balances. For the B balances, you only test before,” he says.

“This updated document now gives manufacturers a little more freedom to decide the best balance for their products,” add Newman. “There’s quite a different set of requirements between manufacturers, and this lets them find a balance that satisfies the needs based on that manufacturer.”

The document has been in use for 47 years and was last updated in 2007. AAMA 902-14, along with other AAMA documents, may be purchased from AAMA’s Publication store.

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