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DAMPERS
Gravity Dampers

Fabricated gravity dampers designed to provide automatic backflow prevention in industrial ventilation and exhaust systems. Available in PVC and CPVC materials, these dampers open with airflow and close when airflow stops, helping maintain efficient system performance while offering excellent corrosion resistance and durability.

Fabricated gravity dampers designed to provide automatic backflow prevention in industrial ventilation and exhaust systems. Available in PVC and CPVC materials, these dampers open with airflow and close when airflow stops, helping maintain efficient system performance while offering excellent corrosion resistance and durability.

Corrosion
Resistant

Chemical
Resistant

Lightweight &
Strong

Low
Maintenance

Specifications
Select Material & Size

Choose your material to view available models, dimensions, and end configurations.

PVC & CPVC Tabs

PVC

Polyvinyl Chloride

CPVC

Chlorinated Polyvinyl Chloride

PVC GRAVITY DAMPERS

Model NumberNominal Duct SizeSizeAB
SBG-PVC-444.5 + 1/1611.96877.75
SBG-PVC-666.625 + 1/1614.06259.5
SBG-PVC-888.625 + 1/1617.12511.5
SBG-PVC-101010.75 + 1/1620.2514
SBG-PVC-121212.75 + 1/1623.312516
SBG-PVC-141414 + 1/1626.37517
SBG-PVC-161616 + 1/1629.2519
SBG-PVC-181818 + 1/1632.312521.25
SBG-PVC-202020 + 1/1635.37523.25
SBG-PVC-242424 + 1/1638.2527.25
22-PVC-Saddle-Blast-Gate-2026-06-16.csv

CPVC GRAVITY DAMPERS

Model NumberNominal Duct SizeA*B*C*Fully Opened Gate
BG-PVC-333.5 + 1/167.751115.25
BG-PVC-444.5 + 1/167.751115.25
BG-PVC-666.625 + 1/169.7513.7520
BG-PVC-777.375 + 1/1610.751522
BG-PVC-888.625 + 1/1611.751624.25
BG-PVC-999.375 + 1/1612.751726
BG-PVC-101010.75 + 1/1614.252030.375
BG-PVC-121212.75 + 1/1616.252234.375
BG-PVC-141414 + 1/1617.252437.625
BG-PVC-161616 + 1/1619.252742.625
BG-PVC-181818 + 1/1621.53047.625
BG-PVC-202020 + 1/1623.53352.562
BG-PVC-242424 + 1/1627.53962.5
23-PVC-Blast-Gate-2026-06-16.csv

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