Fire Damper, Fire Damper, Rectangular, Mounting Type Dynamic, Vertical or Horizontal, Nominal Duct Width 12 In., Nominal Duct Height 8 In., Damper Depth 3-11/16 In., Material 22 ga. Galvanized Steel, Damper Height 7-3/4 In., Damper Width 11-3/4 In., Recommended Retaining Angle 2TGG9, Fire Rated 1-1/2 hr., Free Area 0.401 sq. ft., Fusible Link 165 Degrees F, For Use With Low Pressure HVAC Systems, Standards UL Standard 555, NFPA 80, 90A and 101, IBC, CSFM, NYC MEA. This item has been restricted from sale in the following state(s): []