P.O. Box 410
Schofield, WI  54476

Phone:  715.359.6171
www.greenheck.com

	

Product Specification Guide
Model HBS-xxx Series Blast 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, galvanized steel blast suppressor 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: HBS-330, HBS-430 (blast and normal flow are in the same direction)
Greenheck Model: HBS-331, HBS-431 (blast and normal flow are opposite direction of each other)

B.	Ratings

1.	Differential Pressure: 
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•	Dampers shall have a maximum differential pressure rating of 5.77 psi.
(HBS-330, HBS-331)
•	Dampers shall have a maximum differential pressure rating of 15 psi 
(HBS-430, HBS-431)

2.	Velocity: 
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•	Dampers shall have a maximum velocity rating of 6400 fpm. (HBS-330, HBS-331)
•	Dampers shall have a maximum velocity rating of 4000 fpm. (HBS-430, HBS-431)

C.	Construction:
1.	Frame: 
•	Damper frame shall be 10 ga. galvanized steel (optional: 304 stainless steel, 316 stainless steel, or carbon steel) formed into a 10” x 2” channel with 2 inch flange. 

2.	Blades:
•	Damper blades shall be a minimum of 16 ga. thick galvanized steel airfoil shaped (optional: 304, 316 stainless steel, or galvaneal). 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. (HBS-330, HBS-331)
•	Damper blades shall be a minimum of 14 ga. thick galvanized steel airfoil shaped (optional: 304, 316 stainless steel, or galvaneal). 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. (HBS-430, HBS-431)
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Specifier Notes:  Airflow direction must be specified: horizontal, vertical up, or vertical down. 
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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:  None is standard.  EPDM or silicone are optional.
b.	Jamb: None is standard.  

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:  
•	Minimum ¾ inch diameter plated steel, full length type only. Stainless steel is available as an option. (HBS-330, HBS-331)
•	Minimum 1 inch diameter plated steel, full length type only. Stainless steel is available as an option. (HBS-430, HBS-431)
	
7.	Bearings:  
•	External ball bearings are standard.

8.	Springs: 
•	Springs shall be 301 stainless steel. 
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Specifier Notes: Spring location must be specified: right, left, or both sides. 
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9. 	Finish: Mill on all galvanized steel.  Paint coatings are optional.
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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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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.	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.

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

END OF SECTION