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Rectangular galvanised steel fire damper with fusible link visible

Dayton

Dayton 2TGD7 Rectangular Fire Damper 13-3/4 x 11-3/4 In

SKU CH-5DZ5-AR6R2

Rectangular fire damper rated for 1-1/2 hours with a 165-degree fusible link for low-pressure HVAC systems

  • 1-1/2 hour fire rating per UL 555
  • 772 sq. ft. free area for airflow
  • 165 °F fusible link activates automatically
  • 22 ga. galvanized steel resists corrosion
  • Meets NFPA 80, 90A, 101 and IBC

Rectangular Fire Damper for HVAC

The Dayton 2TGD7 is a rectangular fire damper built from 22 ga. galvanized steel for use in low pressure HVAC systems. It fits a nominal duct width of 14 in. and nominal duct height of 12 in. with a damper depth of 3-11/16 in. The unit carries a 1-1/2 hr. fire rating and meets UL Standard 555, NFPA 80, 90A and 101, IBC, CSFM and NYC MEA standards.

Static Horizontal Mounting

This damper is designed for static mounting in a horizontal orientation. A fusible link rated at 165 degrees F activates the closure mechanism during a fire event. The free area measures .772 sq. ft. to maintain airflow performance. The recommended retaining angle 2TGH3 is sold separately and is required for proper installation.

13-3/4 x 11-3/4 In. Damper Dimensions

The actual damper width is 13-3/4 in. and the damper height is 11-3/4 in., which are the critical measurements for duct compatibility. Verify these dimensions against your ductwork before purchase. This product is not for installations requiring vertical mounting or dynamic airflow closure.

Highlights

  • 1-1/2 hour fire rating per UL 555
  • 772 sq. ft. free area for airflow
  • 165 °F fusible link activates automatically
  • 22 ga. galvanized steel resists corrosion
  • Meets NFPA 80, 90A, 101 and IBC

Specifications

BrandDAYTON

Questions about this item

Does the 165-degree fusible link need periodic replacement?

The fusible link is a one-time thermal release rated at 165 degrees F; it does not require scheduled replacement unless it has activated during a fire event.

What limits airflow through the 0.772 sq ft free area during continuous operation?

The 0.772 sq ft free area is the fixed airflow limit; pressure drop across the damper increases with velocity, so system design must stay within the low-pressure HVAC rating.

How hot does the 22 ga galvanized steel frame get during all-day HVAC use?

The galvanized steel frame remains near duct-air temperature during normal low-pressure HVAC operation; it only sees elevated heat if the 165-degree fusible link triggers in a fire.

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