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Galvanized steel motorized damper, square 15 inch frame, 12 inch duct diameter

Dayton

Dayton 3HHP3 Motorized Damper 12 in 100-240V

SKU CH-ZHED-STT4J

Square motorized control damper with galvanized steel blade, 12-inch length, 100-240V operation, 3500 fpm max velocity

  • Product typeSingle Panel, Power Open, Spring Return
  • Motorized open with spring return for automatic airflow control
  • Single-panel galvanized steel construction resists corrosion in duct systems
  • Fits 12 in nominal duct with 13 in rough opening dimensions
  • Operates on 100-240V supply for flexible installation voltage
  • Rated for 3500 fpm velocity and 4 in wg static pressure

Motorized Damper for 12-Inch Fan Diameter

The Dayton 3HHP3 is a single-panel motorized damper designed for a nominal 12-inch fan diameter. It operates on a wide 100-240V supply and uses a power-open, spring-return mechanism. The unit suits HVAC professionals and facility managers needing automated airflow control in square ductwork.

Pressure and Velocity Limits for Square Ducts

The damper handles a maximum air pressure of 4 in wg and a maximum air velocity of 3500 fpm. Its dynamic damper type and single-panel construction define these operational boundaries. The galvanized steel blades and 14-gauge frame support these ratings within square duct systems.

Square Rough Opening and Wiring Considerations

Installation requires a 13-inch by 13-inch square rough opening to match the 15-inch overall height and width. The power-open, spring-return action needs correct voltage wiring to avoid actuator failure. Misaligned ductwork or debris in the blade path commonly causes binding during operation.

How it compares

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

Price $165.99
Pricier than about 90% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameDAYTON
Product typeSingle Panel, Power Open, Spring Return

Questions about this item

Should I pick the 12 in or 15 in version for my duct?

The damper is built for a 12 in nominal fan diameter; its square frame measures 15 in overall with a 13 in rough opening, so match the 12 in spec to your fan size.

What does the 3500 fpm rating mean once the damper is installed?

It indicates the maximum air velocity the blades can handle in operation; exceeding 3500 fpm may cause excessive wear or noise.

How does the 100-240 V supply affect the actuator's performance?

The wide voltage range lets the motor run on most single-phase mains worldwide without a transformer, so installation voltage does not limit torque or speed.

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