P.O. Box 410
Schofield, WI 54476

Phone: 715.359.6171
www.greenheck.com

Product Specification Guide
Model WD-400 Series Backdraft Dampers
Facility Service SubGroup: Division 23 HVAC (Previously Division 15)

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Note to User: This document is subject to copyright protection and is proprietary to Greenheck Fan Corporation. However, Greenheck Fan Corporation authorizes the user a limited non-exclusive license to use this document or portions of it for the purpose of preparing written product specifications for the above CSI MasterFormat category. All information in this document as provided by Greenheck Fan Corporation is informational in nature and is provided without representation or warranty of any kind as to the user or any other party, including, without limitation, ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, OR NON-INFRINGEMENT. To the greatest extent permitted by applicable law, Greenheck Fan Corporation assumes no liability, and User assumes all liability and risk, for the use or results from the use of this document or the information contained herein, whether as modified by the user or not. Users should consult www.greenheck.com to verify that this document represents the most current version.

Specifier Notes: This product guide specification is written according to the Construction Specifications Institute (CSI) Format.

The section must be carefully reviewed and edited by the Engineer to meet the requirements of the project and local building code. Coordinate with other specification sections and the drawings.

Delete all "Specifier Notes" when editing this section.
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PART 1   GENERAL

1.1	WORK INCLUDED

A.	Galvanized steel backdraft dampers suitable for application in HVAC systems.

1.2	RELATED WORK
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Specifier Notes: Edit the following list as required for the project. List other sections with work directly related to the dampers. ********************************************************************************************

A.	Section 233300 Air Duct Accessories (Formerly 15810 – Ducts)

B.	Section 230913 – HVAC Instrumentation and Controls: Actuators and Operators; Control Dampers (Formerly 15900 – HVAC Instrumentation and Controls: Connections to actuator)

1.3	REFERENCES
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Specifier Notes: List standards referenced in this section, complete with designations and titles. This article does not require compliance with standards but is merely a listing of those used. ********************************************************************************************

A.	AMCA 500-D – Laboratory Methods for Testing Dampers for Ratings

1.4	SUBMITTALS

A.	Comply with requirements of Section 233300 – Submittal Procedures.

B.	Product Data: Submit manufacturer’s product data.
1.	Include leakage, velocity, and maximum pressure data.
2.	Indicate materials, construction, and dimensions.

1.5	QUALITY ASSURANCE

A.	Dampers shall be manufactured by a reputable company who is a member of the Air Movement Control Association (AMCA).

1.6	DELIVERY, STORAGE, AND HANDLING

A.	Delivery: Deliver materials to site in manufacturer’s original, unopened containers and packaging, with labels clearly indicating manufacturer, material, and location of installation.

B.	Storage: Store materials in a dry area indoor, protected from damage, and in accordance with manufacturer’s instructions.

C.	Handling: Handle and lift dampers in accordance with manufacturer’s instructions. Protect materials and finishes during handling and installation to prevent damage.

PART 2   PRODUCTS

2.1	MANUFACTURER

A.	Greenheck, PO Box 410, Schofield, Wisconsin 54476-0410. Phone (715)359-6171. Fax (715)355-6458. Web Site www.greenheck.com.

2.2	BACKDRAFT DAMPER

A.	Model: WD-400 series

B.	Ratings
1.	Differential Pressure: 
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•	Dampers shall have a maximum differential pressure rating of 2 in. wg. 

2.	Velocity: 
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•	Dampers shall have a maximum velocity rating of 2500 fpm.

C.	Construction:
1.	Frame: 
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Specifier Notes: Three frame types are available: no flange, discharge on motor side, or flange on intake.
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Damper frame shall be 18 ga. galvanized steel.

2.	Blades:
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Damper blades shall be a minimum 0.025 in. thick aluminum.
a.	Blade orientation is horizontal or vertical. 

3.	Blade Stops:
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Each blade stop (at top and bottom of damper frame) shall occupy no more than ½ in. of the damper opening area to allow for maximum free area and to minimize pressure loss across the damper. 

4.	Seals: 
a.	Blade Edge: Vinyl is standard.
b.	Jamb: None is standard

5.	Linkage: Internal, galvanized steel tie bars
	
6.	Axles: Plated steel stub axles are standard. Stainless steel is optional.

7.	Bearings: Synthetic bearings are provided standard.

8. 	Finish: Mill galvanized finish is standard.
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Specifier Notes: Standard finish is mill galvanized. Consult Greenheck for assistance in specifying finishes for specific applications. 
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9.	Mounting: The WD-400 series is suitable for horizontal or vertical airflow applications.

2.3	SOURCE QUALITY CONTROL

A.	Factory Tests: Factory cycle damper assemblies to assure proper operation.

PART 3   EXECUTION

3.1	EXAMINATION

A.	Examine areas to receive dampers. Notify the Engineer of conditions that would adversely affect installation or subsequent utilization of dampers. Do not proceed with installation until unsatisfactory conditions are corrected.

3.2	INSTALLATION

A.	Install dampers in accordance with manufacturer’s Installation Instructions.

B.	Dampers must be accessible to allow inspection, adjustment, and replacement of components. The sheet metal contractor shall furnish any access doors in ductwork or plenums required to provide this access. The general contractor shall furnish any access doors required in walls, ceilings, or other general building construction. 

C.	Install dampers square and free from racking. 

D.	The installing contractor shall provide and install bracing for multiple section assemblies to support assembly weight and to hold against system pressure. 

E.	Do not compress or stretch the damper frame into the duct or opening.

F.	Attach multiple damper section assemblies together in accordance with manufacturer’s instructions. Install support mullions as reinforcement between assemblies as required.

G.	Handle dampers using the frame or sleeve. Do not lift or move dampers using blades, actuator or jackshaft.

END OF SECTION