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Protective Vent Assemblies

Donaldson's Protective Vent Assembly provides protection from particles, water, oils, and other liquids while allowing pressure equalization in enclosures. Protective Vent Assemblies are typically used in devices where adhesives are not appropriate, where chemical incompatibilities or extreme temperatures exist, in devices requiring physical protection of the filter path, and/or ease of assembly into the device.


  • Sensors
  • Automotive

Typical Vent Assemblies:

A Vent Assembly is comprised of a filter material attached thermally, with adhesive, or over-molded in a plastic housing and supplied as a vent assembly. Typical Vent Assemblies include:

  • High efficiency membrane - Acts as particulate, hydrophobic and oleophobic barrier while allowing necessary gases to flow through.
  • Plastic housing - Incorporates the filter material and is designed to fit into the enclosure. Available in a wide variety of thermoplastics, elastomers, and other materials.

The Vent Assembly improves the reliability and extends the life of the device because it:

  • Prevents the passage of harmful particles and liquids into the device.
  • Allows for constant pressure equalization during altitude and temperature fluctuations.
  • High efficiency particulate removal
  • Venting of gases and pressure equalization
  • Eliminates the need for costly hermetic sealing
  • Repels water, oils, and other liquids
  • Oil ratings from 1 to 8
  • IP ratings from IP44 to IP67/IP68
  • Easy application and device integration
  • Provides protection with excellent sound transmission
  • Custom sizes and shapes are available

The many options include Donaldson's proprietary Tetratex® white or black ePTFE membrane, woven, nonwoven, and extruded materials such as nylon, polyester, polypropylene, and polyester/polyethylene. 

  • Hydrophobic, oleophobic, and acoustic materials are available
  • Continuous Operating Temperature Range: -40° to 149° C / -40° to 300° F
  • Minimum efficiency of 99.97% on 0.1 µm particles
  • Material data sheets available upon request
  • Manufactured, inspected and packaged in clean room environment
  • Supplied in stackable trays and sealed in cleanroom bags
  • Bulk packaged in cleanroom bags