We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Galvanized steel roof curb adapter reducer 22 in curb to 25 1/2 in fan base 5 in height

Dayton

Dayton 3AZK4 Roof Curb Adapter Trap 22 in Curb 25 1/2 in Fan Base

SKU CH-D7VS-G4CMT MPN 3AZK4

Adapts a 25 1/2 in fan base to a 22 in roof curb using galvanized steel construction with included fasteners

  • TypeDrain Components
  • Adapts 26 in fan base to 22 in roof curb
  • Galvanised steel construction resists corrosion in outdoor installations
  • 18 gauge metal thickness provides structural rigidity for fan mounting
  • Includes eight 1/4-20 Tinnerman speed nuts and bolts for secure fastening
  • Two fasteners per side ensure balanced load distribution across adapter

Roof Curb Adapter for Downblast Fans

The Dayton 3AZK4 adapter connects a 25 1/2 in fan base to a 22 in roof curb. It suits downblast, filtered supply and upblast fans in commercial ventilation projects. The galvanised steel body resists corrosion on exposed rooftops. Installers receive a reducer that bridges the two square openings without custom fabrication.

Bolt-on installation with supplied hardware

Eight 1/4-20 Tinnerman speed nuts and eight matching bolts are included for immediate mounting. The 18 ga steel flanges align with the existing curb and fan base bolt patterns. Misalignment occurs when the curb flange is warped or when fasteners are over-tightened before all bolts are started. Torque evenly to avoid distorting the adapter.

Verify curb and fan dimensions first

Confirm the roof curb measures 22 in square outside dimension before ordering. The fan base must be 25 1/2 in square to match the adapter’s top flange. The overall height adds 5 in to the curb stack, so check available clearance above the roof deck. No other curb or fan sizes are compatible with this model.

Highlights

  • Adapts 26 in fan base to 22 in roof curb
  • Galvanised steel construction resists corrosion in outdoor installations
  • 18 gauge metal thickness provides structural rigidity for fan mounting
  • Includes eight 1/4-20 Tinnerman speed nuts and bolts for secure fastening
  • Two fasteners per side ensure balanced load distribution across adapter

Specifications

TypeDrain Components
BrandDayton
Model3AZK4

Questions about this item

How can I confirm the adapter is seated correctly on a 22 in roof curb after installation?

Verify the galvanized steel flange sits flat on the curb with the 2 1/2 in top flange height visible and the 5 in overall height measured from the curb surface.

Which fasteners are included and what must I supply myself for the fan-to-adapter connection?

The box contains eight 1/4-20 Tinnerman speed nuts and eight 1/4-20 x 3/4 bolts for the curb side; fan-side hardware is not included.

Should I select this 22 in curb adapter or a different size for a 26 in fan base?

Choose this 3AZK4 model because it is built to adapt a 26 in fan base down to a 22 in roof curb.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.