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Galvanised steel roof curb adapter reducing 22 in fan base to 20 in curb

Dayton

Dayton 3AZK3 Roof Curb Adapter 20 in to 22 in

SKU CH-PVKK-8HB19 MPN 3AZK3

Adapts a 22 in fan base to fit a 20 in roof curb using galvanized steel construction and included fasteners

  • TypeDrain Components
  • Adapts a 22 in fan base to a 20 in roof curb
  • Galvanised steel construction resists corrosion in outdoor installations
  • 18-gauge metal thickness provides structural rigidity for rooftop use
  • Supplied with eight Tinnerman speed nuts and bolts for secure fastening
  • 5 in overall height maintains proper fan-to-curb clearance

Roof Curb Adapter 20 in to 22 in

This Dayton 3AZK3 roof curb adapter connects a 21 1/2 inch fan base to a 20 inch roof curb. It is designed for downblast, filtered supply, and upblast fans in commercial ventilation systems. The galvanised steel construction provides corrosion resistance for outdoor roof mounting. Installers use it when the fan base exceeds the curb opening by a small margin.

Installation with included Tinnerman speed nuts

The package supplies eight 1/4-20 Tinnerman speed nuts and eight matching bolts for fastening. Two fasteners per side secure the adapter flange to the curb and fan base. The 18 gauge steel thickness allows drilling without excessive force but requires alignment before tightening. Misaligned holes are the most common issue, so mark and drill carefully on site.

Sustained load performance on roof curbs

The 5 inch overall height and 2 1/2 inch top flange height maintain structural rigidity under continuous fan vibration. Galvanised finish resists weather exposure through seasonal temperature cycles. The reducer design transfers weight evenly across the curb perimeter without deformation. Long-term stability depends on proper bolt torque during initial installation.

Highlights

  • Adapts a 22 in fan base to a 20 in roof curb
  • Galvanised steel construction resists corrosion in outdoor installations
  • 18-gauge metal thickness provides structural rigidity for rooftop use
  • Supplied with eight Tinnerman speed nuts and bolts for secure fastening
  • 5 in overall height maintains proper fan-to-curb clearance

Specifications

TypeDrain Components
BrandDayton
Model3AZK3

Questions about this item

How do I confirm the adapter fits my 20 in curb and 21 1/2 in fan base after installation?

Check that the 20 in curb side seats flush on the roof curb and the 21 1/2 in fan side aligns with the fan base; the 5 in overall height and 2 1/2 in top flange should sit level with no gaps.

What fasteners come in the box and is any additional hardware required?

The package includes eight 1/4-20 Tinnerman speed nuts and eight 1/4-20 x 3/4 bolts — two fasteners per side — so no extra hardware is needed for a standard install.

Which adapter version should I choose to connect a 22 in fan base to a 20 in roof curb?

This model 3AZK3 is built for that exact transition: it adapts a 22 in fan base down to a 20 in curb using 18 ga galvanized steel.

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