Series 40 Corridor Dampers Class ISeries 40 Corridor Dampers Class I Click here for Submittal UL Classified UL 555 and 555S 1 Hour Rating, for use where air ducts penetrate or terminate at openings in the ceilings of interior corridors Specifications: Leakage Classes Class 1 Ultra Low Material Galvanized Steel Temperature Ratings 250 Rated Standard 350 Rated Optional Thermal Disk Ratings 165 Standard 212 Optional Orientation Available for Horizontal Installations Only 22Ga Optional
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