From monthly archives: June 2002
We are pleased to present below all posts archived in 'June 2002'. If you still can't find what you are looking for, try using the search box.
ALL NEW UL555 (Fire Damper) and UL555S (Smoke Damper) Test Standards begin JULY 1, 2002! What do they mean to you?
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Smoke control is a proven technology that saves lives. Smoke or combination fire/smoke dampers and the devices that control them, such as smoke detectors, are important components of a smoke control system.
It is important to understand that smoke dampers do not inherently detect the presence of smoke. It is a corresponding smoke detector that normally causes the damper to close and thus "stop" smoke from leaking through the damper.
UL555S, the UL Smoke Damper Test Standard, recognizes three different leakage classes. Smoke or combination fire/smoke are tested and rated according to one of the following classes:
Class 1 leakage is 4 cfm/sqft at 1” w.g. or less
Class 2 leakage is a maximum of 10 cfm/sqft at 1” w.g.
Class 3 leakage is a maximum of 40 cfm/sqft at 1” w.g.
The volume of air leaking through a closed damper represents smoke "leaking" through the damper during a fire. In life safety situations it makes good engineering sense to specify and install minimum Class 2 smoke or combination fi ...
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Are you specifying, purchasing and installing the best fire or fire/smoke damper in round penetrations?
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