AirPura 400 Series Standard Pre-Filter 2-pack is a Polyester based pre-filter use in AirPura 400 series air purifiers for trapping large dust particles and debris.
The standard pre-filter is a 3/4-inch thick polyester based woven filter media with has the effective surface area of 350 sq. inch.
The pre-filter is the First stage of air filtration system in all models of AirPura 400 series portable air purifiers with the exception of AirPura T400 and T400DLX models, employing the special Tar-Barrier pre-filter of Blue color.
The pre-filter is placed behind the metal mesh and covers the entire surface of the polluted air intake (lower deck of the unit).
The pre-filter protects fine True HEPA filter from faster contamination and helps extend its lifetime.
The pre-filter can be vacuumed right through the metal mesh of the air purifier housing with a soft brush.
The pre-filter has to be replaced with new one when it gets very dirty or ruined.
The pre-filter's lifetime under normal residential conditions - up to 12 months.
Standard polyester pre-filter comes in a pack of 2 filters.