Small but big on ability!

  • The ARO multi-stage oil mist collectors separate mist in progressive stages reducing the potential of plugging.
  • Filters are depth loading and designed to drain, suitable for 24/7 operation.
  • Cross-flow filter design, air flow is horizontal, oil drains vertical down.
  • Ideal for high pressure coolant and oil.
  • Removes mist, smoke and bacteria.
  • Unique 1st and 2nd separation stages.
  • Optional On-Line Cleaning system.

View the Specifications PDF


ARO-400 Separation Stages:

Durable, affordable and high quality ARO-400 Oil Mist Collector by Aeroex Technologies Inc.
The innovative 1st stage `ME` Mechanical Element separates up to 90% of the oil mist and swarf. The smooth metal surfaces quickly drains fluid back to the sump.

The 2nd stage `AG` Agglomerator filter is very unique, manufactured in layers of stainless steel wire mesh weaved with oil attracting fibers. Efficiency is high as the air travels through a bed of coarse and fine fibers at low velocity. The ÀG media is very durable, lasting 10 – 15 years. Can be washed. Used only for coolant applications.

The 3rd stage `CM` Coolant Mist filter is depth loading fiber bed filter that capture small mist particles. Typical life 1 – 3 years. For oil applications, 2nd+3rd stage `OM` Oil Mist pack is an unique two stage depth loading fiber bed filter. The `OM` can be supplied in 3 efficiencies. Typical life 1 – 3 years.

Final 4th stage `HF` HEPA filter captures sub-micron mist, smoke and bacteria. Efficiency 95% @ 0.3 µm is standard, optional 99.9% @ 0.3 µm. Typical life 2 – 4 years HEPA filter is made with exclusive heavy duty filter media, no other product holds as much or lasts as long.

For spare/extra ARO-400 filters, please visit our Filters page here: https://www.aeroex.com/products-aeroex-oil-mist-collectors/oil-mist-collector-filters/

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Additional information

Air Flow

350 – 500 cfm

Machine Tool Enclosure

Up to 125 ft³

Filter Pressure, Max

3.5” wg

Motor (Motorized Impeller)

0.75 hp

Voltage (amps)

115/1/60 (4.9)
230/1/60 (2.5)
230/3/60 (1.6)
460/3/60 (0.93)

Temperature (Max)

160ºF / 70º


220 lbs


21” frame, 32” overall





Inlet Connection

6” Ø


69 dB(A)

Clean Air Measurement

HEPA filter 95% < 0.050 mg/m³
HEPA filter 99.9% < 0.010 mg/m³