Fire Damper, Fire Damper, Square, Mounting Type Static, Vertical, Nominal Duct Width 12 In., Nominal Duct Height 12 In., Damper Depth 3-11/16 In., Material 22 ga. Galvanized Steel, Damper Height 11-3/4 In., Damper Width 11-3/4 In., Recommended Retaining Angle 2TGH2, Fire Rated 1-1/2 hr., Free Area 0.643 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, Includes UL Fusible Link. This item has been restricted from sale in the following state(s): []