CRD-501
The CRD-501 is a round UL555C classified damper with UL555S leakage class I rating.
Certifications:
California State Fire Marshal (Listing # 3230-0981: 0113)
UL 555C (Listing # R13446)
UL 555S (Listing # R13317)
International Building Code (IBC)
National Fire Protection Association (NFPA 92 and 105)
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CRD-501
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