Austin Air Standard Pre-Filter - Black (F400A)

Replacement large particle pre-filter for standard size Austin Air purifiers, in black. It wraps the outside of the main filter and takes the first pass at the air, pulling out dust, hair, pet dander and anything else over roughly 10 microns.

This is the part that keeps your main filter working. Austin Air filters are rated for up to five years, and they get there because the large debris never reaches them. Once a pre-filter loads up it chokes airflow and pushes that job onto the HEPA media, so the recommendation is to change it about once a year while the main filter stays put. Houses with pets, a lot of dust or heavy pollen seasons will go through them faster.

Fits every standard size Austin Air purifier, including the HealthMate®, HealthMate Plus®, Allergy Machine®, Bedroom Machine® and Pet Machine®. No tools needed, it slips on in under a minute. Black is the usual match for black and midnight blue units.

Product Features:

• First Stage Filtration: Removes particles over 10 microns such as dust, hair and pet dander.
• Extends Main Filter Life: Keeps heavy debris off the HEPA media so your filter runs its full term.
• Annual Replacement: Inexpensive consumable, typically changed once a year.
• Fits All Standard Size Units: Interchangeable across the standard size Austin Air lineup.
• Tool Free Install: Wraps on in about a minute.

Not sure of your size? Check the label on the underside of your unit. Standard size models are labeled HM4, like HM400.