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Round galvanized steel fire smoke damper, 5.9 inch diameter, 16 inch length

Dayton

Dayton 3HGL4 Round Fire Smoke Damper 120V 3000 fpm 5.9in

SKU CH-XN46-PH9TN

A round fire and smoke damper with a 5.9 in diameter for 6 in ducts, galvanized steel construction, 120 V AC actuation and a 3000 fpm maximum air velocity

  • Product typeClass II Leakage
  • Galvanized steel construction resists corrosion in ductwork
  • Dynamic damper rated for 3000 fpm airflow velocity
  • Class II leakage rating limits smoke spread
  • 120 V AC actuator simplifies wiring integration
  • Fits 6 in nominal round duct with 5.9 in diameter

Round Fire Smoke Damper

The Dayton 3HGL4 is a Class II leakage damper built from galvanised steel for fire and smoke containment in round ductwork. It suits commercial HVAC installations that require a dynamic damper rated for 120 V AC operation.

Thermals noise and power draw

The unit operates at a nameplate voltage of 120 V AC and is rated for a maximum air velocity of 3000 fpm with a maximum air pressure of 4 in wg. Galvanised steel construction handles the thermal demands of fire-rated assemblies without active cooling.

Nominal duct diameter six inches

This damper fits a nominal duct diameter of 6 in with an overall diameter of 5.9 in and a rough opening width of 6 in. It is not suited for rectangular ductwork or systems requiring a larger nominal size.

How it compares

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

Price $469.99
Pricier than about 92% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameDAYTON
Product typeClass II Leakage

Questions about this item

How do I install the 5.9 inch round fire smoke damper in a 6 inch duct and what step is often missed?

Insert the damper into the 6 inch rough opening so the 16 inch overall length sits flush with the duct, then secure the 20 gauge galvanized steel frame with approved fasteners; the step often missed is verifying the blade swings freely before sealing the joints.

What maintenance will the galvanized steel blade and 120V actuator need over time?

Inspect the blade annually for corrosion and cycle the actuator to confirm it closes against 4 in wg pressure; lubricate the pivot points if the blade sticks and replace the actuator if it fails to operate at 120V AC.

At what airflow limit does the damper reach its maximum rated velocity during sustained operation?

The damper is rated for a maximum air velocity of 3000 fpm; sustained flow above that velocity exceeds the Class II leakage rating and can prevent the blade from closing reliably.

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