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.
Use the Corrosion-Resistant Fans category page to compare 304, 316L, PPH, PVDF, FRP and titanium directions. Use the Industrial Fan Material Selection Guide for broader compatibility screening.
| Material Direction | Typical Starting Point | Critical Review Focus | Related Product Page |
|---|---|---|---|
| 304 Stainless Steel | Humid air, cleaner process exhaust and mildly corrosive ventilation. | Chlorides, cleaning chemicals, condensate and gas-contact scope. | View 304 Fan → |
| 316L Stainless Steel | Wet process exhaust, scrubber systems and selected chloride-risk duty. | Condensate chemistry, chloride concentration, crevices and droplets. | View 316L Fan → |
| PPH Polypropylene | Selected acid mist, alkaline vapor, laboratory and wastewater exhaust. | Solvents, oxidizers, temperature, static risk and plastic stiffness. | View PPH Fan → |
| PVDF Fluoropolymer | Selected severe chemical, oxidizing or high-purity process exhaust. | Strong alkalis, exact resin grade, purity, temperature and welding. | View PVDF Fan → |
| FRP Composite | Chemical exhaust, acid mist, humid gas and larger composite fan duties. | Resin system, temperature, abrasion, UV exposure and fabrication quality. | View FRP Fan → |
| Titanium / Titanium Alloy | Selected wet chlorine, seawater-related and special severe corrosion. | Moisture, reducing acids, grade selection, crevices and fabrication. | View Titanium Fan → |
Review the original gas concentration, temperature, particles, chemical peaks, solvent or oxidizer content and possible direct liquid carryover.
Review high humidity, droplet carryover, condensate chemistry, mist-eliminator performance, wash-liquid composition and shutdown liquid accumulation.
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. A fan before the scrubber sees untreated concentration, temperature and particles; a fan after the scrubber usually sees wetter gas, droplets, condensate and scrubber-liquid chemistry.
No. Stainless steel may suit humid or weakly corrosive gas, while strong acid or alkaline conditions may favor FRP or another verified material.
QIYUE FAN provides 304, 316L, PPH, PVDF, FRP and titanium corrosion-resistant fan directions. The material is selected from the actual medium, while 4-72, 9-19, 9-26 or another fan platform is selected from airflow and pressure. Review the Corrosion-Resistant Fans category page for product entry.
An acid gas exhaust fan is a corrosion-resistant fan used to move acid mist or acid vapor through hoods, ducts, scrubbers and exhaust stacks. The material should be confirmed by acid type, concentration, humidity and temperature.