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Square aluminum roof ventilator hood, 29 by 29 inches, 11 3/4 inch height, assembled for 22 inch curb cutout

Dayton

Dayton 2RB70 Gravity Ventilator Trap 22 in Cutout 11 3/4 in Hood Height

SKU CH-V8N6-55476 MPN 2RB70

Gravity ventilator with 22-inch cutout, 11 3/4-inch hood height, and 740 cfm exhaust airflow

  • Product typeDrain Components
  • Exhausts 740 cfm at 0.100 in SP for strong airflow
  • Supplies 400 cfm at 0.000 in SP for balanced ventilation
  • Fits 22 in cutout for standard roof openings
  • Aluminium housing resists corrosion for long service life
  • Ships fully assembled for immediate installation

Gravity ventilator for roof-mounted exhaust

The Dayton 2RB70 is a gravity ventilator designed for roof-curb mounting. It moves exhaust air at 740 cfm against 0.100 in static pressure and supplies air at 400 cfm at zero static pressure. The aluminum housing arrives fully assembled and fits a 22 in by 22 in roof cutout.

Installers needing curb-mounted gravity relief

This unit suits installers who need a non-powered gravity relief vent that mounts directly on a compatible roof curb. It is not for projects that require motorised airflow, integrated dampers, or filtered intake, because the ventilator has no damper, no filters, and no blade assembly.

22 in square cutout requirement

The ventilator requires a precise 22 in by 22 in roof opening to match its curb interface. A different cutout dimension will prevent proper mounting and sealing, so verifying the opening size is the single check that confirms compatibility.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $224.99
Pricier than about 86% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameDayton
Model name2RB70
Product typeDrain Components

Questions about this item

What does the 0.100 in SP rating mean for the 740 cfm exhaust airflow?

The 740 cfm exhaust airflow is measured at 0.100 inches of static pressure, which is the resistance the ventilator overcomes when moving air out through ductwork.

What roof curb cutout dimensions are required for the 22 in cutout specification?

The unit requires a 22 in by 22 in square cutout in the roof curb for proper installation and sealing.

How is the ventilator secured to the roof curb during installation?

The ventilator mounts on a compatible roof curb such as Grainger part 2RB76 and is fastened through the curb flange; the common error is failing to seal the curb-to-roof joint before setting the unit.

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