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Model WD is a backdraft damper used in ventilation systems, allowing airflow in one direction and preventing airflow in the opposite direction.

Rated for duct velocities up to 2,500 ft/min.
Horizontal and vertical mounting options.

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	SKU	DAMPER WIDTH x DAMPER HEIGHT	MAX VELOCITY	PRESSURE DIFFERENTIAL MAX	MOUNTING POSITION	PRICE
	WD100-10X10 Model / Size: WD-100	10 x 10 in	2500	1	Horizontal	$79.10	Compare
	WD100-12X12 Model / Size: WD-100	12 x 12 in	2500	1	Horizontal	$80.52	Compare
	WD100-16X16 Model / Size: WD-100	16 x 16 in	2500	1	Horizontal	$92.64	Compare
	WD100-18X18 Model / Size: WD-100	18 x 18 in	2500	1	Horizontal	$106.89	Compare
	WD100-24X24 Model / Size: WD-100	24 x 24 in	2500	1	Horizontal	$117.58	Compare
	WD100-30X30 Model / Size: WD-100	30 x 30 in	2500	1	Horizontal	$128.27	Compare
	WD100-8X8 Model / Size: WD-100	8 x 8 in	2500	1	Horizontal	$67.70	Compare
	WD320-10X10 Model / Size: WD-320	10 x 10 in	2500	2	Vertical	$104.75	Compare
	WD320-12X12 Model / Size: WD-320	12 x 12 in	2500	2	Vertical	$104.75	Compare
	WD320-14X14 Model / Size: WD-320	14 x 14 in	2500	2	Vertical	$123.99	Compare
	WD320-16X16 Model / Size: WD-320	16 x 16 in	2500	2	Vertical	$117.58	Compare
	WD320-18X18 Model / Size: WD-320	18 x 18 in	2500	2	Vertical	$123.99	Compare
	WD320-20X20 Model / Size: WD-320	20 x 20 in	2500	2	Vertical	$128.98	Compare
	WD320-22X22 Model / Size: WD-320	22 x 22 in	2500	2	Vertical	$136.11	Compare
	WD320-26X26 Model / Size: WD-320	26 x 26 in	2500	2	Vertical	$163.90	Compare

Picture of Backdraft damper, horizontal mount, Model WD-100, 10 In Sq, No Flange, Performance up to 2,500 ft/min

Backdraft damper, horizontal mount, Model WD-100, 10 In Sq, No Flange, Performance up to 2,500 ft/min

$79.10

The WD-100 series are horizontally mounted backdraft dampers designed to allow vertical airflow up and prevent reverse airflow. The dampers are opened by air pressure differential (assisted by springs) and closed by gravity. The damper features a flangeless, galvanized steel frame and aluminum blades.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, horizontal mount, Model WD-100, 12 In Sq, No Flange, Performance up to 2,500 ft/min

Backdraft damper, horizontal mount, Model WD-100, 12 In Sq, No Flange, Performance up to 2,500 ft/min

$80.52

The WD-100 series are horizontally mounted backdraft dampers designed to allow vertical airflow up and prevent reverse airflow. The dampers are opened by air pressure differential (assisted by springs) and closed by gravity. The damper features a flangeless, galvanized steel frame and aluminum blades.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, horizontal mount, Model WD-100, 16 In Sq, No Flange, Performance up to 2,500 ft/min

Backdraft damper, horizontal mount, Model WD-100, 16 In Sq, No Flange, Performance up to 2,500 ft/min

$92.64

The WD-100 series are horizontally mounted backdraft dampers designed to allow vertical airflow up and prevent reverse airflow. The dampers are opened by air pressure differential (assisted by springs) and closed by gravity. The damper features a flangeless, galvanized steel frame and aluminum blades.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, horizontal mount, Model WD-100, 18 In Sq, No Flange, Performance up to 2,500 ft/min

Backdraft damper, horizontal mount, Model WD-100, 18 In Sq, No Flange, Performance up to 2,500 ft/min

$106.89

The WD-100 series are horizontally mounted backdraft dampers designed to allow vertical airflow up and prevent reverse airflow. The dampers are opened by air pressure differential (assisted by springs) and closed by gravity. The damper features a flangeless, galvanized steel frame and aluminum blades.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, horizontal mount, Model WD-100, 24 In Sq, No Flange

Backdraft damper, horizontal mount, Model WD-100, 24 In Sq, No Flange

$117.58

The WD-100 series are horizontally mounted backdraft dampers designed to allow vertical airflow up and prevent reverse airflow. The dampers are opened by air pressure differential (assisted by springs) and closed by gravity. The damper features a flangeless, galvanized steel frame and aluminum blades.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, horizontal mount, Model WD-100, 30 In Sq, No Flange

Backdraft damper, horizontal mount, Model WD-100, 30 In Sq, No Flange

$128.27

The WD-100 series are horizontally mounted backdraft dampers designed to allow vertical airflow up and prevent reverse airflow. The dampers are opened by air pressure differential (assisted by springs) and closed by gravity. The damper features a flangeless, galvanized steel frame and aluminum blades.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, horizontal mount, Model WD-100, 8 In Sq, No Flange, Performance up to 2,500 ft/min

Backdraft damper, horizontal mount, Model WD-100, 8 In Sq, No Flange, Performance up to 2,500 ft/min

$67.70

The WD-100 series are horizontally mounted backdraft dampers designed to allow vertical airflow up and prevent reverse airflow. The dampers are opened by air pressure differential (assisted by springs) and closed by gravity. The damper features a flangeless, galvanized steel frame and aluminum blades.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, vertical mount, Model WD-320, 10 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

Backdraft damper, vertical mount, Model WD-320, 10 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

$104.75

The WD-320 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-320 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel frame with flange on the discharge side.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, vertical mount, Model WD-320, 12 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

Backdraft damper, vertical mount, Model WD-320, 12 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

$104.75

The WD-320 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-320 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel frame with flange on the discharge side.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, vertical mount, Model WD-320, 14 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

Backdraft damper, vertical mount, Model WD-320, 14 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

$123.99

The WD-320 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-320 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel frame with flange on the discharge side.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, vertical mount, Model WD-320, 16 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

Backdraft damper, vertical mount, Model WD-320, 16 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

$117.58

The WD-320 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-320 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel frame with flange on the discharge side.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, vertical mount, Model WD-320, 18 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

Backdraft damper, vertical mount, Model WD-320, 18 In Sq, Flange on Discharge, Performance up to 2,500 ft/min

$123.99

The WD-320 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-320 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel frame with flange on the discharge side.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, vertical mount, Model WD-320, 20 In Sq, Flange on Discharge

Backdraft damper, vertical mount, Model WD-320, 20 In Sq, Flange on Discharge

$128.98

The WD-320 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-320 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel frame with flange on the discharge side.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, vertical mount, Model WD-320, 22 In Sq, Flange on Discharge

Backdraft damper, vertical mount, Model WD-320, 22 In Sq, Flange on Discharge

$136.11

The WD-320 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-320 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel frame with flange on the discharge side.

Width and height furnished approximately 0.125 in. under size

Picture of Backdraft damper, vertical mount, Model WD-320, 26 In Sq, Flange on Discharge

Backdraft damper, vertical mount, Model WD-320, 26 In Sq, Flange on Discharge

$163.90

The WD-320 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-320 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel frame with flange on the discharge side.

Width and height furnished approximately 0.125 in. under size