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Dayton 3HHN1 Backdraft Damper Horizontal 35-3/4 in Square
Horizontal or vertical backdraft damper with a 35 3/4 inch square galvanised-steel frame and 8.2 sq ft free area
- Product typeNo Flange, Horizontal or Vertical Mount
- Prevents unwanted backdraft with automatic gravity operation
- Fits 36-inch square duct openings without flange
- Galvanized steel frame withstands 1 in wc pressure
- 2 sq ft free area allows high airflow
- Aluminum blades handle 2250 fpm maximum velocity
Square Backdraft Damper for 36-Inch Ducts
The Dayton 3HHN1 is an aluminium backdraft damper built for 36-inch square ductwork. It installs horizontally or vertically without a flange, using a galvanised steel frame that is 20 gauge thick. A single panel covers the opening and allows air to flow in one direction only.
Mounts Directly in Rough Opening
The unit fits a 36-inch square rough opening and measures 35 3/4 inches high by 35 3/4 inches wide with a 4 1/2-inch depth. Its 2-inch frame depth seats inside the duct, leaving a free area of 8.2 square feet. No separate flange or adapter is required, so the damper occupies minimal duct length.
Suits Gravity-Relief and Low-Pressure Systems
Installers handling maximum air velocities of 2 250 fpm and pressures up to 1 inch water column will find the damper adequate. It is not suited for high-pressure duct networks, round duct connections, or applications that demand motorised actuation or multiple panels.
How it compares
Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.
- Price $111.99
- Pricier than about 87% of the 2,607 comparable items (median $18.99).
Specifications
| Product | |
|---|---|
| Brand name | DAYTON |
| Product type | No Flange, Horizontal or Vertical Mount |
Questions about this item
What is the maximum air velocity the Dayton 3HHN1 damper can handle before airflow becomes a limiting factor?
The damper is rated for a maximum air velocity of 2250 fpm, which represents the upper limit for sustained airflow performance.
How much pressure drop does the damper create when installed in a horizontal duct run operating continuously?
The maximum pressure rating is 1 in wc, indicating the pressure differential the damper can withstand during all-day operation without excessive resistance.
What duct dimensions must already exist for this 35-3/4 inch square damper to fit properly?
A rough opening of 36 inches square is required, matching the nominal duct diameter of 36 inches for square duct installations.
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