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Insulated round HVAC access door with steel frame and fiberglass insulation

Ductmate

Ductmate GRDRI12818GA insulated round duct hvac control

SKU CH-XMY8-7DKRM

Insulated steel access door with fiberglass lining fits 17–18 inch ducts and withstands 200 °F

  • Insulated fiberglass core limits heat loss up to 200 Degrees F
  • Rectangular 12 by 8 in access door fits 17 or 18 in nominal duct
  • 22 ga steel construction with two 2 in mounting studs for secure attachment
  • Knob latch allows quick opening without tools for maintenance access
  • Observation port uses steel material for durability in HVAC environments

Insulated round duct access door

This Ductmate insulated round duct access door fits nominal duct diameters of 17 and 18 inches. It provides a rectangular opening measuring 12 inches wide by 8 inches high for inspection or maintenance. The door panel is constructed from steel with a 22-gauge material thickness and includes fiberglass insulation. Two mounting studs, each 2 inches long, secure the unit to the ductwork.

Replaces uninsulated or damaged access panels

This sandwich-style assembly upgrades a plain steel cover by adding a 7/8-inch thick insulated core that reduces thermal loss and condensation. The jump is worth it when the duct system operates at elevated temperatures or passes through unconditioned spaces where heat retention matters. Knob latches allow tool-free opening for routine filter changes or damper checks without removing the entire frame.

Practical limits of the 200-degree rating

The maximum temperature rating of 200 degrees Fahrenheit defines the upper boundary for continuous service in standard HVAC applications. Fiberglass insulation and steel construction remain stable within this range, but the door carries no fire rating and must not be specified for fire-rated shaft enclosures. The rectangular rough opening of 7 5/8 inches high dictates the cut size required in the duct wall.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $105.99
Pricier than about 70% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameDUCTMATE

Questions about this item

What rough-opening height does the 12 in by 8 in rectangular access door require in an 18 in round duct?

The door needs a rough opening 7 5/8 in high to fit the 12 in wide by 8 in high rectangular frame in the 18 in diameter duct.

How are the two mounting studs secured, and what step is often missed during installation?

Two 2 in studs are fastened through the duct wall; the step often missed is tightening both knobs evenly so the fiberglass-insulated sandwich panel seals without gaps.

When should the fiberglass-insulated door panel be replaced given its 200 °F maximum temperature rating?

Replace the panel if duct temperatures exceed 200 °F or if the 22 ga steel skin shows corrosion that could compromise the fiberglass insulation layer.

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