Industrial FRP Dampers for Corrosive Fumes
Industrial FRP dampers in shutter and center-pivot styles stop at 2,500 FPM and 1″ W.G. Past either limit, opposed or parallel blade FRP dampers reach 6,000 FPM and 20″ W.G.
All four styles use fiberglass frames, blades, and axles rated to 200°F. Airstream hardware is stainless steel sealed in fiberglass. The resin carries a Class I flame spread rating of 25 or less.
For round PVC duct up to 12.4″ and 140°F, all-PVC butterfly, backdraft, and motorized dampers fit. Call 847-674-0000 with your gas, CFM, and static pressure.
Have questions? Need a quote?
FRP and PVC Damper Styles and Ratings
Face velocity, static pressure, and duct shape set which FRP or PVC damper fits. Every rating below is the manufacturer’s published figure. Galvanized, aluminum, and stainless styles are on the industrial dampers page.
| Style | Rated to | Size | Operation |
|---|---|---|---|
| FRP automatic backdraft shutter | 2,500 FPM, 1″ W.G., 200°F | Panels to 48″ x 48″, larger as multi-panel | Opens on airflow |
| FRP center-pivot control damper | 2,500 FPM, 1″ W.G., 200°F | Panels to 48″ x 48″, larger as multi-panel | Manual or motor |
| FRP opposed or parallel blade volume damper | 6,000 FPM, 20″ W.G., 200°F | 12″ to 72″ H x 12″ to 48″ W, larger as multi-panel | Manual, electric, or pneumatic |
| PVC adjustable butterfly damper | 140°F, about 95% seal | Round PVC duct, 4″ to 12.4″ | Stainless locking quadrant |
| PVC gravity backdraft damper | 140°F, about 95% seal | Round PVC duct, 4″ to 12.4″ | Opens on airflow, vertical mount only |
| PVC motorized damper | 140°F, about 95% seal | Round PVC duct, 4.9″ to 12.4″ | On/off at 100 to 240 V AC, or 0 to 10 V proportional |
Corrosion Resistant FRP and PVC Dampers
These are the FRP and PVC dampers we supply for corrosive exhaust. Seals, grounding and abrasion coatings, and OSHA guards are added per airstream. Metal styles are on the industrial dampers page.
- FRP automatic backdraft shutter, panels to 48″ x 48″
- FRP center-pivot control damper, panels to 48″ x 48″, manual or motor operated
- FRP opposed or parallel blade volume control damper, 12″ to 72″ H x 12″ to 48″ W
- FRP round butterfly damper
- FRP fixed blade drainable louver, 825 FPM, up to 72″ x 72″
- PVC adjustable butterfly damper, round PVC duct 4″ to 12.4″
- PVC gravity backdraft damper, round PVC duct 4″ to 12.4″
- PVC motorized damper, on/off or 0 to 10 V proportional
Fire Ratings on FRP Dampers and What Each One Means
Three fire ratings come up on corrosive exhaust jobs, and only one of them applies to the FRP damper itself.
- Fire resistance ratings belong to walls and floors.
- Fire protection ratings belong to fire dampers.
- FRP dampers carry a flame spread rating on the resin.
| Rating | Test standard | What it covers |
|---|---|---|
| Fire resistance rating | ASTM E119 or UL 263 | How long a wall or floor assembly holds up in a fire, stated in hours. It rates the barrier, not the damper. |
| Fire protection rating | UL 555 | Whether a damper closes and holds at a rated barrier, stated in hours, typically 1.5 or 3. Met by a fire damper, not an FRP damper. |
| Flame spread rating | ASTM E84 | How fast flame travels across the material surface. FRP dampers use a fire-retardant resin with a Class I flame spread of 25 or less, the same class called out on FRP fans and duct. |
Industrial Damper Types We Supply
| Damper type | Use |
|---|---|
| Control dampers | Modulate airflow, manual or actuated |
| Volume control dampers | Opposed or parallel blade balancing |
| Butterfly dampers | Single blade, round or rectangular duct |
| Bubble-tight isolation dampers | Zero-leak shutoff |
| Blast gate dampers | Slide gate shutoff on dust and fume branches |
| Zone dampers | Branch control in multi-zone systems |
| Balancing dampers | Set and lock branch airflow |
| Backdraft dampers | Open on airflow, close on reverse flow |
| Pressure relief dampers | Vent overpressure at a set point |
| Line safety dampers | Fire and smoke isolation |
| Fire dampers | UL 555 listed closure at rated walls |
| All industrial dampers | Galvanized, aluminum, stainless, FRP, and PVC |
FRP Damper Questions
Plain answers on mounting, connecting, and sealing FRP and PVC dampers.
Call 847-674-0000 with anything specific to your job.
FRP dampers can be installed outdoors. External housing surfaces carry a UV-resistant resin coat at least 10 mil thick. The fiberglass laminate does not turn brittle at -40°F.
FRP dampers connect by duct mount or flange mount. PVC dampers have bell-end sockets sized to round schedule 40 PVC duct. Socket depth is 2", or 1.75" on the 4" size.
A PVC butterfly or backdraft damper adds less than 5% airflow restriction. The butterfly plate turns 90 degrees from open to closed.
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