Standard Construction
Sleeve/Frame: Integral 12" x 20 ga. (305 x 1.0) galvanized steel with 1-1/2" x 20 ga. (38 x 1.0) galvanized steel inegral single side mounting angle.
Blades: 24 ga. (0.7) galvanized steel - curtain style.
Fire Closure Device: UL Listed Fusible link.
Fire Closure Temperature: 165oF (75oC)
Minimum Size: 6" x 6" (152 x 152)
Maximum Size: Single Section: Vertical: 36" x 48" (914 x 1219)
Ratings
UL 555 Fire Resistance Rating: 1-1/2 hour (vertical)
Maximum Dynamic Closure Velocity: 4,000 fpm (20.4 m/s)
Maximum UL 555S Rated Pressure: 4 in. wg. (1.0 kPa)