Greenheck Fan WD-400 Series dimensions Application and Design, Standard Construction

WD-400 SERIES

Non-Motorized Backdraft Damper

Horizontal or Vertical Mount (Intake)

Application and Design

The WD-400 series are non-motorized backdraft dampers which may be mounted either vertically for intake air or mounted horizontally to allow vertical airflow down and prevent reverse airflow. The dampers are opened by air pressure differential and

closed by springs. Optional motor packs are not available.

Ratings (See page 2 for specific limitations)					W*
Pressure:	2.0 in. wg (498 Pa) - differential
	pressure
Velocity:	2500 fpm (13 m/s)			W*
Temperature:	180°F (82ºC)
		W*			H*
Standard Construction
Frame:	18 ga. (1.3mm) galvanized steel
Blades:	0.025 in. (0.64mm) aluminum			H* Single Panel
Axles:	3/16 in. (4.8mm) dia. zinc plated steel
	rod, full length
			H*
Bearings:	Synthetic (acetal)			Double Panel
Linkage:	0.064 in. (1.6mm) 6061T6 aluminum

tie bar

Blade Seals: Vinyl

Size Limitations (see pages 3 & 4 for specific limitations)

Minimum Panel Size

Triple Panel	*W & H dimensions furnished
	approximately 1/8 in. (3mm) under size.

8 in. W x 8 in. H (203mm x 203mm)

Maximum Panel Size

Single Panel: 31 in. W x 74 in. H (787mm x 1880mm)

Double Panel (WD-400/410): 50 in. W x 74 in. H (1270mm x 1880mm)

Double Panel (WD-420/430): 63 in. W x 74 in. H (1600mm x 1880mm)

Triple Panel (WD-420/430): 74 in. W x 74 in. H (1880mm x 1880mm)

Options and Accessories (at additional cost)

• 11/2		in. (38mm) flange on discharge:	WD-420
•	11/2	in. (38mm) flange on intake:	WD-430
•	Stainless Steel Axles

*H

3	/8 in.
	3

3	3	/4	in.
Max.

Airflow

*H

Airflow

Model WD-410

No Flange

1	/2	in.
	1

*H

Airflow

1 1 /2 in.

*H

Airflow

						1	1		in.
3	3/	in.		5/				/2
			4		in.
	8			8
			Max.					1			5
						3		/2 in.		4		/8 in.
										Max.

Model WD-400	Model WD-420
No Flange	Flange on Discharge

1	1	/2 in.
3			in.	4		/8 in.
		/2
	1				5
				Max.

Model WD-430

Flange on Intake