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Galvanized steel insulated round duct with rectangular access door

Ductmate

Ductmate GRDRI161222GA Sandwich Style Insulated Round Duct traffic safety equipment

SKU CH-PX4Z-D0QP9

Insulated round duct access door fits 21 in to 28 in diameters with a 16 in by 12 in opening and 200 Degrees F rating

  • Main materialHAWA
  • Sandwich-style insulation maintains consistent duct temperatures up to 200°F
  • Galvanised steel construction resists corrosion in outdoor traffic environments
  • SMACNA compliance confirms the duct meets recognised industry standards
  • 16 × 12 in insulated access door allows quick internal inspection
  • Adjustable fit covers round ducts from 21–22 in and 25–28 in diameter

Sandwich-Style Insulated Round Duct

The Ductmate GRDRI161222GA is a galvanised steel access door designed for facility and traffic safety installations. It fits duct diameters from 21 in to 22 in and includes an insulated door panel measuring 16 in by 12 in. The unit conforms to SMACNA standards for commercial ductwork applications.

Capacity and Temperature Limits

The door withstands operating temperatures up to 200 Degrees F max, making it suitable for standard HVAC exhaust and supply lines. Rough opening dimensions of 15 3/4 in width by 11 7/16 in height define the installation envelope. It does not accommodate duct sizes outside the 21 in to 22 in primary range or the 25 in to 28 in included range.

Hinge-Free Galvanised Construction

This model ships without hinges, requiring installers to provide their own mounting hardware for the steel frame. The galvanised finish protects against corrosion in outdoor or unconditioned spaces. Buyers needing a pre-hinged assembly or a different temperature rating should specify an alternative configuration.

How it compares

Measured against everything we stock in Traffic Cones, Signs & Safety Gear, at today’s prices. Recalculated every night.

Price $143.99
Pricier than about 78% of the 1,503 comparable items (median $61.99).

Specifications

Product
Brand nameDUCTMATE
Size & build
Main materialHAWA

Questions about this item

Will the 21 in to 22 in duct diameter fit my existing round ductwork?

This insulated access door is made for duct diameters from 21 in to 22 in and also covers 25 in to 28 in sizes.

How can I verify the door seals correctly after installation?

Check that the galvanized steel door sits flush within the 15 3/4 in by 11 7/16 in rough opening and operates up to the 200 °F temperature rating.

Does the package include hinges or mounting hardware for the 16 in by 12 in door?

The unit ships with the insulated access door only; hinges are not included and must be sourced separately.

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