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American National Standard for Acoustic Performance Rating for Operational Noise of Architectural Hardware
This Standard establishes methods for defining levels of acoustic performance for various types of architectural hardware whose non-acoustic performance aspects are described in the applicable BHMA product Standards. For further information, consult the full standard, ANSI/BHMA A156.42 Standard for Acoustic Performance Rating for Operational Noise of Architectural Hardware.
BHMA has created this series of Hardware Highlights to provide useful, accessible information about builders hardware for anyone with an interest in devices that hang, control, secure, and trim the doors. BHMA is the trade association which represents almost all of the North American manufacturers of builders hardware. One of its main activities since 1983 has been the development and maintenance of ANSI-approved standards for many separate product categories.
Product Performance: Purchasers of hardware certified to A156.42 (https://buildershardware.com/CertificationProgram/Certified-Products-Directory) can be assured products will perform to their expectations.
Below are an explanation and some examples of the evaluations conducted for certification:
The standard tests the product in three modes of operation. This includes Actuation (e.g. bar, lever, paddle), Release (removing hand pressure from the actuator) and Close (allow the door to close).
Recordings from the different modes of operation are analyzed using acoustic metrics based on a sound jury study. The highest acoustic score is the final score. A merit score above 10 passes (least disruptive sound), while 10 or below fails (most disruptive sound).
A useful set of terminology covering architectural hardware is provided. For example: Acoustic The characteristics of sound that contribute to the overall auditory experience by individuals.
Builders hardware provides several attributes that are essential to building safety and performance, including egress and fire protection.
There are various types of trim which meet the ADA and A117.1 requirements for operable parts to be “operable with one hand and shall not require tight grasping, pinching or twisting of the wrist.”
Resistance to corrosion is evaluated through a salt spray test to ASTM B117 providing confidence to be aesthetically attractive and stay that way.
Type Numbers: Another significant contribution of standards for product specification is a numbering system for the type of product, its function and trim type. Please consult A156.42 for the full list; examples are provided here: Exit Device: A156.3–Type 4-Push is a Narrow Stile Rim Exit Device, Push Bar Mortise Lock: A156.13–F13–Lever is a Mortise Lock, Dormitory Function, Lever Trim
In addition to the ANSI Type Numbers, it is important to consult manufacturer’s catalogs for the availability of different trim types, optional features, and installation methods.