The 3SP1 spring hinge is UL fire listed in category GVEV.R1943,
Swinging Fire Door Closers. It can
currently be found under the LCN brand in the UL Online Certifications
Directory. The spring hinges have been evaluated in accordance with Standard UL
10C, designed to be used with swinging type fire doors rated up to and
including 3 hours. Per NFPA80, a minimum of two spring hinges must be used, and the maximum door opening is 3' x 7'.
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