Greenheck Dampers - UL 555 Damper Fire Test

Fire Damper Test UL 555 - www.greenheck.com/products/ai...
Greenheck's rigorous in-house testing of dampers has long been recognized as the benchmark for innovation and quality assurance. Our state-of--the-art, in-house damper and louver testing facility enables us to quickly develop new products for unique applications. This presentation demonstrates our ability to test, and qualify, fire dampers in accordance with Underwriters Laboratories ( UL ), standard five-five-five.
UL five five five requires the damper to be mounted in a fire rated wall or floor built within a bulkhead. The barrier and bulkhead is then clamped to the test furnace.
During the initial minutes of the test, heat shields cover the damper and contain the heat within the chamber until the damper closes. During a one and one half-hour test, the damper is exposed to temperatures up to one thousand seven hundred ninety two degrees Fahrenheit over a ninety-minute time, temperature curve. During the three-hour test, exposure equates to a maximum of one thousand nine hundred twenty five degrees Fahrenheit for one hundred eighty minutes.
When the exposure time has been reached, the barrier is removed from the furnace with the flame side exposed. An impact and erosion test is performed to test the structural integrity of the product. After the one and one half-hour flame test, a fire hose with a water pressure of thirty p s i is sprayed directly at the damper, for a calculated time of one and one-half seconds per square foot of damper face area.
The three-hour test requires the water pressure to be forty-five p s i and the damper is sprayed for three seconds per square foot. The water is sprayed evenly across the surface of the damper for the calculated exposure time.
During the fire text, and after the impact and erosion portion, UL inspects the damper. When looking directly at the face of the damper, the visible sight through openings can not exceed three-eighths of an inch in the vertical plane, or one thirty second of an inch in the horizontal plane. UL uses a pass, fail method. All of the mentioned requirements need to be met throughout the testing process for the damper to pass.
If you have further questions about this damper fire test, please contact us. And remember, Greenheck offers the most Air Movement and Control Association (AMCA) licensed, and the most UL classified dampers in the industry. When it comes to dampers, look to Greenheck.

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[@spidyr1992]

frankly there is a some things about this test that is wrong, including putting plates over the damper to contain the heat. This to ensure the fusible link operates before the damper seizes. I wonder if they supply clients with plates with every damper that can be used in the event of a fire? Also the damper is tested outside of the furnace and not inside which means the casing is not subjected to the heat. Much improvements required.