P.O. Box 410
Schofield, WI 54476

Phone: 715.359.6171
www.greenheck.com
Product Specification Guide
Model WDR-53 and SSWDR-53 Round 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 - 2004 Edition.

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 unnecessary "Specifier Notes" when editing this section.
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PART 1   GENERAL

1.1	WORK INCLUDED

A.	Galvanized steel round 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 23330 – Submittal Procedures.

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

1.5	QUALITY ASSURANCE

A. 	Product is subject to set periodic testing to assure performance is maintained.

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	ROUND Control DAMPERS

A.	Model: WDR-53 and SSWDR-53  round backdraft dampers

1.	Leakage:
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•	Dampers shall have a rating of 4 cfm /sq. ft. @ 1 in wg. 

2.	Elevated Operational Temperature:
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•	Dampers shall have a temperature rating of 180° F. 

3.	Differential Pressure: 
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Specifier Notes: It is recommended that the lowest level consistent with the project’s HVAC system design be specified. ************************************************************************************
•	Dampers shall have a minimum differential pressure rating of 3 in. wg.

4.	Velocity:
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Specifier Notes: It is recommended that the lowest level consistent with the project’s HVAC system design be specified. ************************************************************************************
•	Dampers shall have a minimum velocity rating of 2000 fpm.

B.	Construction:
1.	Frame and Sleeve:
•	The damper frame and sleeve shall be of one piece design, made with 20 ga. galvanized steel and a groove for added strength. (WDR-53)
•	The damper frame and sleeve shall be of one piece design, made with 20 ga. 304 stainless steel and a groove for added strength. (SSWDR-53)

2.	Blades: 
•	Aluminum (WDR-53)
•	304 stainless steel (SSWDR-53)

3.	Blade Seals: Closed cell neoprene/EPDM/SBR blend

4.	Axles:
•	Minimum ½ inch dia., material is plated steel. (WDR-53)
•	Minimum ½ inch dia., material is 304 stainless steel. (SSWDR-53)

5.	Airflow:
•	Vertical Up
•	Vertical Down
•	Horizontal

6.	Mounting:
•	Vertical
•	Horizontal

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.	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. 

B.	Install dampers round and free from racking. 

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

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

E.	Install connections to [electric, pneumatic] actuators as specified in section 230913.

END OF SECTION