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UL 33
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UL 33 8th Edition, April 14, 2015 UL Standard for Safety Heat Responsive Links for Fire-Protection Service
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Description / Abstract:
These requirements cover heat responsive links used for
fire-protection service. These links consist of devices intended
for installation under load conditions such as for use with
automatic fire suppression systems; or automatic closure devices
for doors, windows, dampers or smoke relief vents.
Heat responsive links are categorized by temperature rating, type of coating or plating, minimum and maximum design load, and other factors which may have a bearing on their intended use.
Heat responsive links are categorized by temperature rating, type of coating or plating, minimum and maximum design load, and other factors which may have a bearing on their intended use.