Austin Air Bedroom Machine HM402 replacement filter FR402 contains True HEPA filter, Enhanced Carbon canister filter and HEGA filter for Austin Air Bedroom Machine HM402 air purifier.
True HEPA filter traps 99.97% of microscopic airborne contaminants down to 0.3 micron in size.
Activated carbon canister contains 15 lbs. of specialty Superblend adsorbent for effective removal of VOCs and specific chemicals.
The High Efficiency Gas Adsorption (HEGA) dust carbon cloth filter ensures a speedy removal of gaseous chemicals.
All three filters are combined together in a single filter assembly, and are replaced simulteneously.
Austin Air Bedroom Machine replacement filter assembly comes with a pre-filter of matching color:

• Black for units in Black and Blue colors
• White for units in White and Sandstone colors

The whole filter assembly has to be replaced when either True HEPA or one of activated carbon filters gets saturated.
Filter's Lifetime: 2 to 5 years (under normal residential conditions).
The filter assembly is covered by a 5-Year Pro-rated manufacturer's warranty (applicable only to units used under normal residential conditions).