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Square galvanised steel fire damper with fusible link

Dayton

Dayton Square Fire Damper 5-3/4 In W 165 Deg F

SKU CH-J8KE-G8T7F

A square fire damper rated for 165 degrees Fahrenheit and 1-1/2 hour fire resistance in low-pressure HVAC systems

  • TypeDynamic With Fire Resistance Rating Less Than 3 Ho
  • 1-1/2 hour fire rating protects duct penetrations
  • 165 °F fusible link activates automatically in fire conditions
  • Dynamic mounting suits vertical or horizontal installations
  • 22-gauge galvanised steel construction resists corrosion
  • UL 555 and NFPA 80, 90A, 101 compliance
  • .110 sq ft free area maintains airflow performance

Fire Damper for Low-Pressure HVAC Systems

This square fire damper installs in vertical or horizontal ductwork to maintain fire-rated barriers in commercial buildings. Its dynamic design closes automatically when the fusible link melts, preventing flame and smoke spread through the ventilation system. Suitable for new construction or retrofit projects requiring UL 555 compliance.

165 Degrees F Fusible Link Activation

The damper releases at 165 degrees Fahrenheit, a fixed temperature rating that determines when the blades close during a fire event. This specific activation point must match the engineer's fire protection schedule; a different rating will not satisfy the approved design. Verify the required temperature before ordering.

0.110 Sq Ft Free Area and 1-1/2 Hour Rating

The assembly provides a free area of 0.110 square feet through a 5-3/4 inch square opening, sized for six-inch nominal ducts. It carries a one-and-a-half-hour fire resistance rating under UL 555 and meets NFPA 80, 90A and 101 standards. Not intended for high-pressure duct systems or applications requiring a larger airflow passage.

Highlights

  • 1-1/2 hour fire rating protects duct penetrations
  • 165 °F fusible link activates automatically in fire conditions
  • Dynamic mounting suits vertical or horizontal installations
  • 22-gauge galvanised steel construction resists corrosion
  • UL 555 and NFPA 80, 90A, 101 compliance
  • .110 sq ft free area maintains airflow performance

Specifications

BrandDAYTON
TypeDynamic With Fire Resistance Rating Less Than 3 Ho

Questions about this item

How does the 165 degree fusible link work once the damper is installed in a real HVAC system?

The fusible link holds the blades open until duct temperature reaches 165 degrees Fahrenheit, then releases so the damper closes automatically to block fire spread.

What does the UL 555 listing actually limit for this square damper in practice?

UL 555 certifies the assembly for a 1-1/2 hour fire rating in dynamic low-pressure HVAC systems up to the tested pressure differential.

What physical clearance does the 5-3/4 inch wide square frame need to mount in a 6 inch nominal duct?

The damper fits a 6 inch nominal duct; the 5-3/4 inch frame sits inside with a retaining angle such as 2TGG4 securing the perimeter.

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