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Square fiberglass manual damper 21 by 21 inches for 18 inch fan

Dayton

Dayton GGS 47522 Manual Damper 21 in 18 in Fan

SKU CH-AC53-NFH06

A 21-inch square fiberglass manual backdraft damper sized for an 18-inch fan with a 3 3/8-inch frame depth

  • Fits 18 in fans for precise airflow control
  • 21 in square frame covers standard rough openings
  • Fiberglass frame resists moisture and corrosion
  • 6 mm thick frame adds rigidity
  • Manual backdraft damper prevents reverse airflow

Dayton GGS 47522 Manual Damper

This Dayton GGS 47522 manual damper fits an 18 in fan within a 21 in square frame. It is designed for backdraft prevention in ventilation systems where automatic operation is not required. The fiberglass frame measures 2.6 mm thick with a 3 3/8 in depth.

Square fiberglass frame installs in standard rough

The square frame fits directly into a prepared opening matching the 21 in overall dimensions. No specialised tools are required beyond basic fasteners for the frame material. Ensure the 18 in fan aligns centrally so the damper blades can swing freely without binding against the frame edges.

Gravity blades close when airflow stops

Under sustained airflow the blades remain open, allowing continuous ventilation through the duct. When the fan shuts down, gravity returns the blades to a closed position, limiting backdraft without motorised components. The fiberglass construction resists corrosion in humid or outdoor environments.

Highlights

  • Fits 18 in fans for precise airflow control
  • 21 in square frame covers standard rough openings
  • Fiberglass frame resists moisture and corrosion
  • 6 mm thick frame adds rigidity
  • Manual backdraft damper prevents reverse airflow

Specifications

BrandDAYTON

Questions about this item

How do I verify the manual damper is operating correctly after installation?

Check that the damper blades open fully when the 18 in fan runs and close tightly by gravity when the fan stops, with no visible gaps around the 21 in square frame.

What comes in the box and what must be purchased separately?

The box contains the Dayton GGS 47522 fiberglass frame damper with 2.6 mm thickness and 3 3/8 in depth; mounting hardware, duct transitions and the 1BLJ3 fan are not included.

Which size should I choose for an 18 in fan opening?

Select this 21 in square model because its frame dimensions match the 18 in fan diameter specified in the product data.

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