Series 77 Type A | 1½ Hour Rated

Dynamic Fire Damper

Standard Profile Fire Damper – 4¼” 22Ga 1 Piece Rollformed Frame
Dynamic for Installation in Systems Where Fans Remain Running During Fire and Smoke Control
UL Classified UL 555 – 1½ Hour Rating, Dynamic for Use in Installations Rated Less Than 3 Hours

Specifications:

Blades

Blades in Air-Stream

Material

Galvanized Steel – Standard
Stainless Steel – Optional

Fusible Link

165° Rated Link – Standard
212° Rated Link – Optional

Orientation

Available for Vertical or Horizontal Installations

22Ga Optional Sleeves

12” Sleeve – Standard
8”, 17”, 20”, or 24” Lengths – Optional

Vertical Sizes

4” x 4” to 36” x 36”

Horizontal Sizes

4” x 4” to 24” x 24”

Airflow Pressure Ratings

Vertical: 36” x 36” = 2,000 FPM at 4” W.G.
Horizontal: 24” x 24” = 2,000 FPM at 4” W.G.
Horizontal: 12” x 12” = 3,000 FPM at 4” W.G.