The exhaust system must capture corrosive vapor before it spreads into the workshop. Hood location, enclosure degree and capture velocity determine whether the source is effectively controlled.
The gas may then pass through a scrubber, absorber, filter or other treatment device. The fan must overcome the complete resistance while maintaining negative pressure through the process route.
Material selection must match the actual medium. Acid mist, alkaline vapor, solvents, humid gas, crystallizing compounds and mixed exhaust can require different resins, metals, seals and connection materials.
The fan must maintain capture airflow after losses from hoods, ducts, elbows, dampers, scrubber packing, demisters, filters and the exhaust stack are included.
Scrubber resistance may vary with liquid flow, packing condition, deposits and maintenance status. The fan should be checked against the expected operating condition.
For a new project, source capture, scrubber design, duct material, fan position and stack arrangement should be evaluated as one complete route.
For an existing system, inspect corrosion location, fan material, scrubber condition, duct leakage, process changes and current airflow before choosing a replacement.
FRP fans are commonly considered when the exhaust contains acid mist, alkaline components, humid corrosive gas or chemical vapor that may quickly attack ordinary carbon steel.
Provide the chemical components, concentration, temperature, humidity, dust content, operating time and whether the medium can crystallize, condense or become sticky.
FRP temperature capability depends on resin system, structure and operating conditions. High-temperature gas requires separate review.
The fan can be arranged before or after treatment equipment depending on system pressure, corrosion exposure, leakage direction and maintenance strategy.
No. Stainless steel may suit humid or weakly corrosive gas, while strong acid or alkaline conditions may favor FRP or another verified material.
The 4-72 FRP fan is the main existing corrosion-resistant product direction. Higher-resistance projects may require 9-19 or 9-26 platforms with confirmed material configurations.