The American Architectural Manufacturers Association (AAMA) has published an updated standard for acoustical performance. AAMA 1801-13, “Voluntary Specification for the Acoustical Rating of Exterior Windows, Doors, Skylights and Glazed Wall Sections,” describes the use of sound transmission loss test data to calculate Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC) ratings.
“The recently updated AAMA 1801-13 includes some important information regarding the differences between STC and OITC,” says Scott Warner of Architectural Testing, chair of the AAMA task group that developed the specification. “This updated AAMA document also clearly highlights the significance of measuring the air leakage, operating force and latching force before a product is tested for acoustical performance. Architects and owners can be confident that fenestration products, tested by accredited laboratories in accordance with AAMA 1801-13, are fully documented inclusive of the installation details and comprehensive description of the product tested.”