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Square galvanized-steel backdraft damper with aluminium panels, 17 3/4 inches wide and high, 4 1/2 inches deep

Dayton

Dayton 2FTU9 Backdraft Damper 17 3/4 Square

SKU CH-E84Z-V5YVQ

Square aluminium backdraft damper with galvanised-steel frame for 18 in ducts, 2.2 sq ft free area and 2000 fpm max velocity

  • 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.

Highlights

  • 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

Specifications

BrandDAYTON
TypeNo 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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