Horizontal Dynamic Fire Damper - Series 77 Type A

Series 77 Type A - Horizontal Dynamic Fire Damper

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Thinline 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 
212° Rated Link 

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.

These products are custom made and, according to our policy, can not be returned or refunded. Please connect with our team if you need to double check any sizes

When you order an HVAC fire damper, you order it based on the nominal duct size (the interior dimensions of the duct or sleeve opening). We intentionally reduce the physical dimensions of the damper frame by 1/4 inch in both width and height (e.g., a 12" x 12" ordered damper arrives measuring exactly 11-3/4" x 11-3/4").

• Installation Clearance: The 1/4" deduction ensures that the damper frame slips smoothly inside the sleeve or ductwork without forcing, binding, or distorting the frame.
• Thermal Expansion: Fire dampers must operate flawlessly during an emergency. The slight clearance allows room for the metal components to expand under intense heat without jamming the curtain blades.
• Round Transitions: All round fire dampers will include a transition to make the necessary round connection (e.g. an 8" round damper will have a 10" frame measuring exactly 9-3/4" x 9-3/4")

Availability: Estimated production lead time is 7 to 15 days. Select all options to view pricing for your exact configuration.