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Fiberglass (FRP) Dampers

Fiberglass (FRP) dampers are vital for applications that have a corrosive element that primarily exist in fume or vapor form. FRP dampers provide useful in corrosive conditions where ventilation systems need balancing, back flow prevention applications, or fume exhaust systems just to name a few. FRP dampers are composed of fiberglass and Isophthalic polyester resin and the joints are mended with industrial grade epoxy adhesive. Isophthalic polyester resin conveys a Class I flame spread rate of 25 or less. Hartzell Air Movement offers a complete line of fiberglass air control products for corrosive environments including fans and blowers, backdraft damper and louvers. Dampers and louvers are cataloged in standard sizes but multiple panel construction with reinforcement is available for much larger size assemblies.

FRP Dampers Available


Backdraft Dampers – designed for free air inlet velocity of 4,000 FPM at a maximum size of 48” x 72”.  Airfoil backdraft damper designs have a maximum differential pressure 5.5” to 16” W.G. and V groove blade backdraft dampers, 2.5” to 10” W.G.

Low Velocity Center-pivoted Damper – designed for a free air inlet velocity of 2,500 FPM at standard size of 12”x12” to a maximum of 48” x 48”.  Maximum differential pressure of 1” W.G., suitable up to 200⁰ F, with a manual operator or motor operated option.

Center-pivoted volume control dampers – designed for a free air inlet velocity of 6,000 FPM, suitable up to 200⁰ F and a maximum differential pressure 20” W.G.

Butterfly control damper – designed for free air inlet velocity of 6,000 FPM, minimum size 4” and maximum size 72”, but multiple panel construction with reinforcement allow much larger size assemblies Differential pressure varies with damper diameter and is from 10” W.G. to 30″ W.G.

Round Control Inlet Vane Damper (IVD)- Designed for free air inlet velocity of 4,000 FPM, standard sizes are 12” to 72” diameter with custom designs available upon request.

FRP Damper Options


Additional available options include:

  • Abrasive/erosion resistant coating
  • Nexus surface veil
  • Electrostatic grounding

Where are FRP Dampers Applied


What Products are Purchased with Industrial Dampers?


Complementing our fans is a complete package of FRP, PVC and CPVC air system components including:

  • Supply and exhaust louvers
  • Dome exhauster covers
  • Stacks
  • Complete duct systems
  • Specialty designed hoods

SysTech supplies ventilation products for aggressive environments.   If you are plagued with equipment corrosion and failure due to the environmental conditions, call us.

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