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Dayton 2FTU9 Backdraft Damper 17 3/4 Square
Square aluminium backdraft damper with galvanised-steel frame for 18 in ducts, 2.2 sq ft free area and 2000 fpm max velocity
- Product typeNo Flange, Horizontal or Vertical Mount
- Square 17 3/4 in frame fits 18 in duct opening
- Single-panel aluminium blade opens to 2.2 sq ft free area
- Galvanised steel frame rated for 2000 fpm maximum velocity
- Mounts vertically or horizontally without a flange
- 20-gauge steel withstands 1 in wc pressure differential
Square backdraft damper for 18-inch duct
The Dayton 2FTU9 is a flange-free aluminium damper designed to mount vertically or horizontally in a square 18-inch rough opening. It suits HVAC installers and maintenance teams who need gravity-operated airflow control without a flanged frame.
Free area of 2.2 square feet at 2000 fpm
The single-panel aluminium blade provides 2.2 sq ft of free area and is rated for air velocities up to 2000 fpm and a maximum pressure of 1 in wc. The galvanised steel frame is 20-gauge with a 2-inch depth and the overall length is 4.5 inches.
Fits 18-inch square rough opening only
The damper requires an exact 18-inch square rough opening and a matching 18-inch fan diameter; it will not suit round ducts, rectangular openings or smaller fan sizes. Builders needing a flanged frame or a different duct shape must select another model.
How it compares
Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.
- Price $41.99
- Pricier than about 70% 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
Will the galvanized steel frame on this Dayton 2FTU9 damper need replacement due to corrosion over time?
The frame is 20-gauge galvanized steel, which resists rust in typical HVAC environments; replacement is only needed if the coating is damaged or the installation sees prolonged moisture.
At what airflow does the 2.2 sq ft free area of this 17 3/4 in square backdraft damper become the limiting factor?
The published maximum air velocity is 2000 fpm; exceeding that rate will make the free area the bottleneck and increase pressure drop beyond the 1 in wc rating.
How much heat or noise does this aluminium-blade damper add when the fan runs continuously?
The damper itself has no motor and generates no heat; noise is limited to blade flutter at high velocity, so staying at or below 2000 fpm keeps sound low.
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