We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Square galvanised steel fire damper with fusible link

Dayton

Dayton Square Fire Damper 17-3/4 In. W

SKU CH-2R5V-6SM1D

A square fire damper for low-pressure HVAC ducts with a 1-1/2 hour fire rating and 165-degree fusible link

  • TypeDynamic With Fire Resistance Rating Less Than 3 Ho
  • 1-1/2 hour fire rating protects duct penetrations
  • 165 °F fusible link triggers automatic closure in fire
  • 640 sq ft free area maintains HVAC airflow
  • 22 ga galvanised steel resists corrosion in ductwork
  • UL 555 and NFPA 80, 90A, 101 compliance meets code

Square Fire Damper 17-3/4 In.

The Dayton square fire damper is a dynamic-rated component for vertical or horizontal installation in low-pressure HVAC systems. It features a 22-gauge galvanised steel construction with a 1-1/2 hour fire rating and a 165-degree F fusible link. The unit provides a free area of 1.640 sq. ft. for airflow.

UL 555 and NFPA compliance upgrade

This damper meets UL Standard 555 along with NFPA 80, 90A and 101, plus IBC, CSFM and NYC MEA standards. It replaces non-rated or lower-rated dampers where code requires a dynamic fire resistance rating of less than 3 hours. The jump is worth it when building inspections demand documented compliance with these specific standards.

For commercial HVAC contractors

The product suits contractors installing fire-rated ductwork in commercial buildings that require the listed certifications. Builders needing a different duct width, height or fire rating should look at other models. Those without low-pressure system requirements or the specified retaining angle may need alternative solutions.

Highlights

  • 1-1/2 hour fire rating protects duct penetrations
  • 165 °F fusible link triggers automatic closure in fire
  • 640 sq ft free area maintains HVAC airflow
  • 22 ga galvanised steel resists corrosion in ductwork
  • UL 555 and NFPA 80, 90A, 101 compliance meets code

Specifications

BrandDAYTON
TypeDynamic With Fire Resistance Rating Less Than 3 Ho

Questions about this item

What duct opening does the 17-3/4 In. square fire damper fit?

It fits a nominal 18 In. by 18 In. duct opening; the damper itself measures 17-3/4 In. wide by 17-3/4 In. high.

How is the dynamic fire damper mounted, and what step is often missed?

Mount vertically or horizontally in the duct using the recommended 2TGH8 retaining angle; the step often missed is securing that angle on all four sides to maintain the 1-1/2 hr. fire rating.

When does the fusible link need replacement?

Replace the 165 Degrees F fusible link after any fire exposure or if inspection per NFPA 80 shows damage or corrosion.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.