P.O. Box 410
Schofield, WI  54476

Phone:  715.359.6171
www.greenheck.com

	

Product Specification Guide
Model HTOD-xxx Series TORNADO 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
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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.	Flanged frame, heavy duty type, painted galvanized steel tornado 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 actuators).

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.

B.	IECC - International Energy Conservation Code

1.4	SUBMITTALS

A.	Comply with requirements of Section 01330 – Submittal Procedures.

B.	Product Data: Submit manufacturer’s product data.
1.	Include leakage, velocity, pressure drop and maximum pressure data
2.	Indicate materials, construction, and dimensions.
3.	Include pressure drop data for all damper sizes in accordance with AMCA 500-D test figure 5.3 (Ducted Inlet, Ducted Outlet)
4.	Include a copy of Installation Instructions.

1.5	QUALITY ASSURANCE

A.	Dampers shall be manufactured under an ISO-9001 Quality Control Program

B.	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 and material, 

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	HVAC Backdraft Dampers

A.	Greenheck Model: HTOD-330 (closes in the same direction as normal flow)
Greenheck Model: HTOD-331 (closes in the opposite direction as normal flow)

B.	Ratings
1.	Differential Pressure: 
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•	Dampers shall have a maximum differential pressure rating of 83 in. wg

2.	Velocity: 
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•	Dampers shall have a maximum velocity rating of 6400 fpm. 

C.	Construction:
1.	Frame: 
•	Damper frame shall be ¼ inch thick painted galvanized steel (optional: 304 stainless steel or 316 stainless steel) formed into a 12” x 3” channel frame. 

2.	Blades:
•	Damper blades shall be 16 ga. thick double thickness galvanized steel (optional: 304 or 316 stainless steel). Blade orientation is horizontal. Blades are held open during normal operation by constant-force springs (counterweight balances are not acceptable) and designed to close upon a sudden increase in room pressure. 
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Specifier Notes:  Airflow direction must be specified: horizontal.
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3.	Blade Stops:
Each blade stop (at top and bottom of damper frame) shall occupy no more than ½” of the damper opening area to allow for maximum free area and to minimize pressure loss across the damper. 

4.	Seals: 
a.	Blade Edge:  EPDM is standard.  Silicone is optional.
b.	Jamb: EPDM is standard.  Silicone is optional.

5.	Linkage: External, heavy duty type with steel clevis arms and plated steel tie bars and pivot pins with nylon pivot bearings. Stainless steel is available as an option.
		
6.	Axles:  
•	Axle diameter varies with damper width.
	
7.	Bearings:  
•	External ball bearings are standard.

8.	Springs: 
•	Springs shall be stainless steel. 

9. 	Finish: Hi Pro Polyester painted steel on damper frame and mill finish on blades.
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Specifier Notes:  Standard finish is painted steel. Consult Greenheck for assistance in specifying finishes for specific applications 
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2.3	ACCESSORIES

A.	Mounting Holes: Mounting holes are optional.

2.4	SOURCE QUALITY CONTROL

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

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.

B.	Caution should be taken to ensure proper clearances for counterweight and blade swings during normal damper operation.

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

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

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

END OF SECTION