Series 10 Fire and Smoke Dampers Class I.Series 10 Fire and Smoke Dampers Class I Click here for Submittal UL Classified UL 555 and 555S Combination Fire and Smoke Damper with 1 Hour Rating, for use in installations rated less than three hour Meets NFPA Standard 90A ICC Building Codes Specifications: 120 Volts 24 Volts Leakage Classes Class 1 Ultra Low Material Galvanized Steel Temperature Ratings 250 Rated Standard 350 Rated Optional Thermal Disk Ratings 165 Standard 212 Optional
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