P.O. Box 410
Schofield, WI  54476

Phone:  715.359.6171
www.greenheck.com

	

Product Specification Guide – Model HBT-221 and HBT-321
Model Bubble Tight 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.	Flanged frame, steel isolation dampers suitable for application in HVAC (or process) 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 Section 15810 – Ducts)

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

C.	Damper manufacturer shall have calibrated test equipment, tools and standard procedures for performing bubble tight damper testing.  Test procedures shall be submitted to the engineer for approval prior to authorization to begin manufacturing.

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	Bubble Tight Dampers

A.	Greenheck Model: HBT-221 and HBT-321

B.	Ratings
1.	Leakage: 
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•	Dampers are to be zero leakage bubble tight type to 10 in. wg as required by AMCA Standard 500D (HBT-221)
•	Dampers are to be zero leakage bubble tight type to 20 in. wg as required by AMC Standard 500D (HBT-321)

2.	Differential Pressure: 
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•	Dampers shall have a maximum differential pressure rating of 10 in. wg (HBT-221)
•	Dampers shall have a maximum differential pressure rating of 20 in. wg (HBT-321)

3.	Velocity: 
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•	Dampers shall have a maximum velocity rating of 3900 fpm (HBT-221)
•	Dampers shall have a maximum velocity rating of 4000 fpm (HBT-321)

C.	Construction:
1.	Frame: 
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Specifier Notes: 12 ga frame thickness are economical and sufficiently strong for this application.  Thicker frames can be specified for more robust construction if desired.
Specifier Notes: Contractor should coordinate mountings holes as required for installation – frames can be supplied blank for field drilling or with Greenheck supplied mounting patterns.
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•	Damper frame shall be a minimum of 12 ga. painted steel (optional Type 304SS or Type 316SS) formed into a rolled channel frame with 2 inch flange.

2.	Blades:
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•	Damper blades shall be a minimum of 12 ga. painted steel flat dual skin with perimeter seal (optional Type 304SS or Type 316SS) and reinforced as required to meet the system pressures it will be installed in. Blade orientation is horizontal. Blade action is parallel.

3.	Seals: 
•	Blade Edge:  Silicone is standard.

4.	Linkage:
•	Plated steel is standard. Stainless steel is optional.

5.	Axles:
•	Minimum ¾ inch diameter plated steel and as required to meet the system pressures the damper will be installed in. Stainless steel axles are optional (HBT-221).
•	Minimum ¾ inch or 1 inch diameter plated steel and as required to meet the system pressures will be installed in. Stainless steel axles are optional (HBT-321).

6.	Bearings:
•	Outboard ball bearings are standard. 

7.	Axle Seals:
•	Double gland stuffing boxes are standard.

8.	Finish: Hi Pro Polyester paint coating is standard.  Options coatings are also available.	
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Specifier Notes:  Consult Greenheck, for assistance in specifying other finishes for specific applications 
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2.3	ACCESSORIES

A.	Actuators:
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Specifier Notes:  Specify actuator type using the guidelines below.  Please note that Spring Return Electric actuators can vary greatly in price as torque requirements get higher.  If larger torque actuators are needed, tremendous cost savings can be realized if PO/PC actuators can be utilized.  Actuators are mounted externally to the damper frame.  Specifier selects the required actuator type as shown below
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1.	Type - Electric: 
•	Commercial Grade, Industrial Grade, No Preference, Best Cost
•	Electric, 24V or 120V or 230V – AC or DC
•	Power Open/Power Close (PO/PC) or Spring Return (fail direction needed if spring return is chosen)
•	2-position or Modulating – (modulating signal needs to be specified if modulating operation is required – this is typically 4-20mA or 2-10VDC)
•	Nema Rating if needed
•	Auxiliary Limit Switches if needed

2.	Type – Pneumatic: 
•	Power Open/Power Close (PO/PC) or Spring Return (fail direction needed if spring return is chosen)
•	2-position or Modulating– (modulating signal needs to be specified if modulating operation is required – this is typically 3-15 PSI or 4-20mA)
•	Pneumatic supply pressure – 20 psi or 80 psi
•	Auxiliary Limit Switches if needed

2.4	SOURCE QUALITY CONTROL

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

B.	Factory Test each damper for bubble tight construction before shipment. Test report shall be supplied with shipment for each damper

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.

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

END OF SECTION