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Square galvanized steel fire damper, 7-3/4 inch frame, fusible link visible

Dayton

Dayton Square Fire Damper 7-3/4 In 165 Deg F

SKU CH-F8KH-R51DW

A 7-3/4-inch square fire damper rated for 165 degrees Fahrenheit with a 1-1/2 hour fire resistance and 0.241 square feet free area

  • Product typeDynamic With Fire Resistance Rating Less Than 3 Ho
  • 1-1/2 hour fire rating protects ductwork
  • UL 555 and NFPA 80/90A/101 compliance meets code
  • 165 °F fusible link activates automatically in fire
  • 22 ga galvanised steel construction resists corrosion
  • 241 sq ft free area maintains airflow

Square Fire Damper 7-3/4 In

This square fire damper fits 8-inch nominal duct openings and installs in vertical or horizontal orientations. It is built from 22-gauge galvanized steel and carries a 1-1/2 hour fire rating. The unit uses a 165-degree Fahrenheit fusible link and provides .241 square feet of free area. It suits low-pressure HVAC systems requiring UL 555 compliance.

Dynamic Mounting and Standards

The damper mounts dynamically and meets UL Standard 555, NFPA 80, NFPA 90A, NFPA 101, IBC, CSFM, and NYC MEA requirements. Its fire resistance rating is less than three hours. The 3-11/16-inch depth allows installation in standard ductwork. The 165-degree link activates automatically during fire conditions to restrict flame and smoke spread.

Verify Duct Size and Retaining Angle

Confirm the nominal duct width and height are both 8 inches before ordering. The recommended retaining angle is part number 2TGG5, which must be sourced separately. Ensure the HVAC system operates at low pressure as specified. This damper is not suited for high-pressure or industrial exhaust applications.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $64.99
Pricier than about 79% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameDAYTON
Product typeDynamic With Fire Resistance Rating Less Than 3 Ho

Questions about this item

What size square fire damper should I select for an 8-inch nominal duct?

The 7-3/4 inch square damper fits an 8-inch nominal duct width and height, with a depth of 3-11/16 inches.

What does the 165-degree fusible link do once the damper is installed?

The 165°F fusible link releases the blades automatically when duct temperature reaches that point, closing the damper to stop fire spread.

How does the UL 555 listing and 1-1/2 hour fire rating limit actual use?

UL 555 and the 1-1/2 hour rating certify the damper for dynamic low-pressure HVAC systems in vertical or horizontal mounting per NFPA 80, 90A, 101, IBC, CSFM and NYC MEA.

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