Capabilities and Variations

Spunstrand® Inc. manufactures both Zero-Leak (ZL) and Balancing Dampers (BA) for the corrosive fume handling industry for a variety of environments and applications. These dampers can be used to regulate air flow and/or isolate a particular part of a system. They are constructed of FRP providing a durable corrosion resistant product that can be used for numerous industrial applications such as: semiconductor manufacturing plants, wastewater treatment plants, pharmaceutical facilities, pulp and paper plants, metal plating ships and chemical facilities.

The FRP duct industry’s first Zero-Leak damper was installed in 1995 and patented by Spunstrand® Inc. . The damper was developed by Spunstrand® Inc.’s design team to be certified leak free through individual water testing. Each Spunstrand® Inc. ZL damper is manufactured with a resilient, machined rubber seat permanently formed into the duct wall. Balancing dampers are applicable where ultra low leakage is not critical. These leakage rates should not exceed 5%.

Why Spunstrand Zero-Leak and Balancing Dampers?

• Over forty years of FRP experience
• 100 millimeter RTP-1 quality clear liners
• Balancing dampers available in sizes 2″-96″ Ø
• Better workmanship, individually quality tested
• Delivered fully operational and tested
• Zero-Leak dampers available in sizes 8″–96″ Ø
• Resistant to corrosion and environmental wear
• Standard options other manufacturers charge for

Damper Applications:

• Wastewater treatment plants
• Laboratory exhaust
• Micro-electronic plants
• Aerospace industry
• Food processing facilities
• Petrochemical plants
• Glass and metal finishing
• Pulp and paper industry
• Automotive industry

Process Examples:

• Scrubber and fan isolation
• System balancing
• Automated processes modulation
• System cleaning
• Tool install or change out isolation
• System shutdown
• Clean room isolation

Spunstrand® Inc.’s Zero-Leak and Balancing series dampers are manufactured under an ISO 9000 based Quality Assurance program. All dampers are inspected for quality, blade fit, range of operation, and each Zero-Leak damper is tested and certified leak free to 6″ water column, and up to one psi when requested.

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