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Galvanized steel square backdraft damper, 19 3/4 inch frame, aluminum spring panels, no flange

Dayton

Dayton 3HHL6 Backdraft Damper 19 3/4 in Square Mount

SKU CH-JQWG-8A99F

A square backdraft damper for 20-inch ductwork that mounts horizontally or vertically without a flange

  • TypeNo Flange, Horizontal or Vertical Mount
  • Versatile installation fits horizontal or vertical ducts
  • 5 sq ft free area allows strong airflow
  • Galvanized steel frame resists corrosion in ductwork
  • Spring-loaded panels open automatically under air pressure
  • Compact 4.5 in depth suits tight spaces

Dayton 3HHL6 Backdraft Damper

The Dayton 3HHL6 is a square backdraft damper designed for 20 inch nominal duct systems. It mounts vertically or horizontally without a flange. The galvanised steel frame measures 19 3/4 inches square and 4 1/2 inches deep. A single aluminium panel with spring assistance provides 2.5 square feet of free area.

Replaces flange-mounted dampers

This model suits installations where a flanged frame cannot be accommodated. The frameless design fits directly into a 20 inch square rough opening. The upgrade is worthwhile when ductwork lacks the extra clearance a flange requires or when a low-profile 4.5 inch depth is specified.

Sustained airflow up to 2000 fpm

The damper handles continuous air velocities of 2000 feet per minute against a maximum pressure of 1 inch water column. Spring-loaded operation maintains consistent panel response during prolonged fan cycles. Galvanised steel construction resists corrosion in long-term ventilation service.

Highlights

  • Versatile installation fits horizontal or vertical ducts
  • 5 sq ft free area allows strong airflow
  • Galvanized steel frame resists corrosion in ductwork
  • Spring-loaded panels open automatically under air pressure
  • Compact 4.5 in depth suits tight spaces

Specifications

BrandDAYTON
TypeNo Flange, Horizontal or Vertical Mount

Questions about this item

What size rough opening does the 19 3/4 in square Dayton backdraft damper require?

The damper fits a 20 in square rough opening that measures 20 in by 20 in.

How is the no-flange Dayton 3HHL6 damper secured in a vertical or horizontal duct?

Insert the 4.5 in deep frame into the 20 in square opening and fasten through the galvanised-steel frame into the surrounding ductwork.

When should the aluminium spring-loaded panel be inspected or replaced?

Check the panel each season; replace it if the spring no longer closes the blade tightly or if corrosion reduces the 2.5 sq ft free area.

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