Metalworking and Fabrication Air Filtration

Wet Machining and Dry Work Need Different Equipment

The most common mistake in a machine shop is treating every airborne contaminant as the same problem. Mist and dust behave differently and need different equipment.

Wet machining, where high-pressure coolant hits a spinning workpiece, atomizes metalworking fluid into fine droplets. These stay suspended, coat every surface in the shop, and leave a slick film on floors and inside electrical cabinets. Dry machining and grinding produce dry metal particulate instead, which requires a dust collector rather than a mist collector. Welding and plasma cutting add metal fume, another category again. And where coolant contacts hot metal during grinding or heat treating, you get smoke on top of mist, which needs finer filtration than mist alone.

Telltale Signs on a Machine Shop Floor

• A visible haze hangs in the air around the machines

• Floors have a slick film that keeps coming back

• Coolant residue is building up inside electrical cabinets

• Operators report skin or respiratory irritation

• Mist escapes the machine enclosure when doors open

• You're adding high-pressure coolant or running heavier cuts

Matching the Collector to the Fluid and the Process

Electrocorp specifies based on what your process actually generates, because a mist collector and a dust collector are not interchangeable. Coalescing stages handle oil and coolant mist with drainage built in for the liquid load, while dry particulate from grinding and cutting calls for a different media entirely. Where machining produces visible smoke, a HEPA stage after the primary mist removal handles the submicron fraction that mist filtration alone lets through.