Austin Air Allergy Machine HM405 replacement filter contains True HEPA filter and lightweight HEGA carbon filter for Austin Air Allergy Machine HM405 air purifier.
Austin Air Allergy Machine True HEPA and Lightweight HEGA carbon filters are combined together in one filter assembly.
Austin Air Allergy Machine replacement filter assembly comes with a pre-filter of matching color:

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

True HEPA filter traps 99.97% of microscopic airborne contaminants down to 0.3 micron in size.
The lightweight Military grade HEGA carbon filter contains cloth-embed dust carbon filter for High Efficiency Gas Adsorption.
The whole filter assembly has to be replaced when either True HEPA or activated carbon HEGA filter reaches the end of its lifetime.
Filter's Lifetime: 2 to 5 years (under normal residential conditions).
The filter assembly is covered by the 5-Year Pro-rated manufacturer's warranty (applicable only to the units used under normal residential conditions).