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The Austin Air Replacement Pre-Filter (F400) replaces the pre-filter that comes with Austin Air standard-size air purifiers. This pre-filter traps particles over ~10 microns that can easily be seen with the eye during the first stage of Austin Air's multi-stage filtration process. The pre-filter thus helps to prolong the life of the inner filters, especially the HEPA filter. The F400 pre-Filter lasts for years under normal operating conditions and with regular care.

Because it can be seen through the air cleaner's grille, choose the Black F400 pre-filter for Black-Silver-Blue units or the White F400 pre-filter for Sandstone-White units.

The Austin Air F400 Pre-Filter Features:

- Austin Air Replacement Pre-Filter (F400) captures large particles over 10 microns, like dust, hair, soot and pet dander
- Protects life of HEPA and other inner filters
- Lasts for years with proper care, under normal conditions
- Designed to be vacuumed from outside of unit to avoid costly 3-month filter changes
- Fits all standard-size Austin Air purifiers: AUSTIN OLDER MODEL NUMBERS Allergy Machine (HM405) Bedroom Machine (HM402) HealthMate (HM400) HealthMate Plus (HM450) Pet Machine (HM410)

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