Ruskin Manufacturing	February 1997
3900 Dr. Greaves Road
Kansas City, Missouri  64030
Phone	(816) 761-7476
Fax		(816) 765-8955

Product Guide Specification

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Specifier Notes:  This product guide specification is written according to the Construction Specifications Institute (CSI) MasterFormat, Three-Part SectionFormat, and PageFormat, contained in the CSI Manual of Practice.  Five-digit section numbers are from MasterFormat, 1995 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 "Specifier Notes" when editing this section.
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SECTION 15820

HEAVY DUTY COUNTERBALANCED BACKDRAFT DAMPERS

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Specifier Notes:  This section covers Ruskin Manufacturing heavy duty galvanized steel counterbalanced backdraft dampers, Model CBS7.  Consult Ruskin for assistance in editing this section for specific applications.
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PART 1	GENERAL

1.1	SECTION INCLUDES

A.	Heavy duty galvanized steel counterbalanced backdraft dampers.

1.2	RELATED SECTIONS

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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.
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A.	Section 15810 - Ducts.

1.3	REFERENCES

A.	AMCA 500 - Test Methods for Louvers, Dampers and Shutters.

1.4	SUBMITTALS

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

B.	Product Data:  Submit manufacturer's product data, including leakage, pressure drop, and maximum pressure data in accordance with AMCA 500 testing.  Submit data for full range of damper sizes.

C.	Shop Drawings:  Submit shop drawings indicating materials, construction, dimensions, and installation details.

1.5	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 indoors, protected from damage and in accordance with manufacturer's instructions.

C.	Handling:  Protect materials and finishes during handling and installation to prevent damage.

PART 2	PRODUCTS

2.1	MANUFACTURER

A.	Ruskin Manufacturing, 3900 Dr. Greaves Road, Kansas City, Missouri 64030.  Phone (816) 761-7476.  Fax (816) 765-8955.

2.2	HEAVY DUTY COUNTERBALANCED BACKDRAFT DAMPERS

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Specifier Notes:  Consult Ruskin for assistance in selecting from options for specific applications.  
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A.	Fabrication:
1.	Model:  CBS7.
2.	Frame:  8 inches x 2 inches x minimum 14 gage (203 x 51 x minimum 2 mm) [galvanized steel channel] [Type 304 stainless steel channel] [Type 316 stainless steel channel].  One piece construction.
a.	Bolt Holes:  [One flange] [Both flanges].
3.	Blades:  Maximum width 7 inches (178 mm) x minimum 16 gage (1.6 mm) galvanized steel.
4.	Axles:  Minimum 1/2 inch (13 mm) diameter plated steel, tack welded and clipped to blade.
5.	Bearings:  Ball bearings pressed into frame.
6.	Linkage:  3/16 inch (5 mm) thick x 3/4 inch (19 mm) plated steel tie bar with minimum 16 gage (1.6 mm) galvanized steel linkage arms located on face of blades in airstream.  Stainless steel pivot pins.
7.	Counterbalance:  Located [out of airstream] [in airstream].

8.	Seals:
a.	Blade:  Mechanically attach blade seals to blade.  Neoprene blade seals, maximum 250 degrees F (121 degrees C).
b.	Jamb:  Wind stops fitted with neoprene sponge seal located directly behind blade edge.

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Specifier Notes:  Standard finish is mill galvanized.  Consult Ruskin for assistance in specifying special materials and finishes for specific applications.
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9.	Finish:  Mill galvanized.
10.	Maximum Operating Temperature:  [250 degrees F (121 degrees C)] [ __________ ].
11.	Assembly:  Factory assemble damper components.

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Specifier Notes:  Dampers may tolerate higher temperatures, pressures, and velocities than those specified.  Consult Ruskin when a damper is to be applied in conditions exceeding recommended maximums.
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B.	Performance Data for Damper Width of 48 inches (1,219 mm):
1.	Maximum System Pressure:  4.0 inches w.g. (1.0 kPa).
2.	Maximum System Velocity:  3,000 feet per minute (914 m/min).
3.	Leakage with Seals:  Based on pressure differential of 1 inch w.g. (0.25 kPa).
a.	Percent of Maximum Flow:  0.50.
b.	Leakage:  15 cubic feet per minute/square foot (4.5 m3/min/m2).  
4.	Leakage without Seals:  Based on pressure differential of 1 inch w.g. (0.25 kPa).
a.	Percent of Maximum Flow:  1.33.
b.	Leakage:  40 cubic feet per minute/square foot (12.0 m3/min/m2).

C.	Performance Data for Damper Width of 12 inches (305 mm):
1.	Maximum System Pressure:  10.0 inches w.g. (2.5 kPa).
2.	Maximum System Velocity:  3,000 feet per minute (914 m/min).
3.	Leakage with Seals:  Based on pressure differential of 1 inch w.g. (0.25 kPa).
a.	Percent of Maximum Flow:  0.67.
b.	Leakage:  20 cubic feet per minute/square foot (6.0 m3/min/m2).
4.	Leakage without Seals:  Based on pressure differential of 1 inch w.g. (0.25 kPa).
a.	Percent of Maximum Flow:  3.33.
b.	Leakage:  100 cubic feet per minute/square foot (30.0 m3/min/m2).

PART 3	EXECUTION

3.1	EXAMINATION

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

3.2	INSTALLATION

A.	Install dampers at locations indicated on the drawings and in accordance with manufacturer's instructions.

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Specifier Notes:  Consult Ruskin for dampers with air flow other than horizontal.
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B.	Install dampers square and free from racking with blades running horizontally with horizontal air flow.

C.	Install bracing for multiple section assemblies to support assembly weight and to hold against system pressure.  Install bracing at every horizontal and vertical mullion.

END OF SECTION