Fire Damper, Square, Mounting Type Dynamic, Vertical or HorizontalNominal Duct Width 16 In., Nominal Duct Height 16 In., Damper Depth 3-11/16 In., Recommended Retaining Angle 2TGH7, Material 22 ga. Galvanized SteelDamper Height 15-3/4 In., Damper Width 15-3/4 In., Fire Rated 1-1/2 hr., Free Area 1.257 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 Life Safety DampersFire DampersDynamicSteel spring-assist closing.Accommodate airflow in either direction.Fire-resistance rating: 1-1/2 hr. Max. temp.: 165 F Curtain blade style NFPA 80 requires retaining anglesVelocity rating: 2,000 fpm Pressure rating: 4" wgUL, NFPA, IBC, MEA, CSFM