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.

Oil mist in the air poses different threats to workers than most dust and fumes, and it behaves differently, as well. If there is one thing to get right in your strategy for collecting oil mist, it’s this: choose the right kind of filter.

The best filter to use to collect oil mist is called a packed-bed, or coalescing, filter. A packed-bed filter pulls oil out of the air and allows the oil to drain off. This filter works even when saturated, whereas normal filter media becomes soaked and much less effective.

RoboVent provided oil mist filters have several major benefits, including:

  • The ability to pull even the finest oil mist out of the air
  • The ability to drain the oil off of the filter
  • A long life span, due to the filter’s ability to shed oil and remain in operation
  • Major costs savings, due to long filter life and low maintenance

RoboVent also produces packed-bed filters that come in three different sizes and two different efficiency levels.


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