Coalescing Oil Mist Filters

Clean Air Matrix

RoboVent engineers are experts in every category of air filtration and ventilation. The four categories below represent the major options for treating your contaminated air. RoboVent has designed solutions for each of these categories and has manufactured air filtration systems of unrivaled quality.

For more information about these categories, see Indoor Air Quality 101.


Large blowers and air filtration equipment draw contaminated air from the plant (typically at the ceiling level), filter it and return it to the plant. This is a proven solution in plants welding large parts with overhead cranes. It reduces the haze in the air, resulting in a cleaner working environment, with no negative pressure or heat loss.


Air in the immediate area of the welding activity is captured in a hood system, then filtered and returned to the plant. This is the best solution whenever possible. It allows for a more flexible system and removes the smoke directly from the operator's breathing zone. There are many types of source capture, including overhead hoods, crossflow hoods, fume arms and fume guns, some of which work better than others.


Large exhaust fans draw contaminated air from the plant and exhaust it directly into the environment, typically through the roof or walls. This is a traditional method and often results in negative air pressure. Also, it is very difficult to climate-control your plant and the system may not work well in the winter.

Air in the immediate area of the welding activity is captured in a hood, sent through ductwork, and exhausted directly into the environment. This is a lower capital cost alternative to filtration, but tends to result in high operating costs and large, unsightly ducting systems that work less efficiently with modifications. It also results in negative pressure problems.

Some industrial air filter systems remove water and reduce the amount of mist, aerosols and fumes in the atmosphere. The mist pulled from the source will coalesce or turn into a hardened substance in the duct work which is a fire hazard. Coalescing filters prevent these substances from building up.
Coalescing filters, or mist eliminators, are needed to capture oil mist found in returned air and remove water and oil droplets from cooling coils and evaporative media. Or in the case of humidifiers, remove unevaporated moisture.

Coalescing Mist Eliminator Filters We Offer:

  • Metal Mesh Oil or Water Mist Eliminator (Model MME)
  • Metal Mesh Oil or Water Mist Eliminator (Model MMS)


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