Air King FRAK80 Fire Rated Quiet Exhaust FansThe Fire Rated Exhaust Fan Series is Designed to Automatically Shut Off and Seal the Duct From the Rest of the Dwelling Once the Temperature of the Air Passing Through the Damper Exceeds that of the Fusible Link.These Fans Meet the NFPA (National Fire Protection Association) Standard 90A and the Ceiling Radiation Damper is ULC Classified and Rated for 3-4 Hour Fire Resistance.Air King Ventilation Products Certifies that the Models are Licensed to Bear the AMCA Seal. The Ratings Shown are Based on Tests and Procedures Performed in Accordance with AMCA Publication 211 and AMCA Publication 311 and Comply with the Requirements of the Certified Ratings Program. When Fire Codes Need to be Met, Air King"s Fire Rated Series Exhaust Fans are the Best Solution. Three Part System that Includes a Housing, Motor/Blade/Grill and Damper Available in Single Packs or in Contractor Packs of 4 Low Profile and Durable, all Metal Grill with a Painted, White Finish Quiet operation 4" metal duct collar with back draft damper Easily Installs Using the Included Adjustable Hanging Brackets CFM (Air Movement): 80 Sones (Sound): 2.6 Energy Star Exhaust Capacity: 75 - 100 sq. ft. Duct Size: 4" Metal Amps: 0.3