AirPura Standard Replacement pre-filter 2-pack is original AirPura replacement pre-filter.
The standard pre-filter is a 3/4-inch thick polyester based woven filter media with the effective surface area of 570 sq. inch.
The pre-filter is the first stage of air filtration system in all models of AirPura portable air purifiers with exception of AirPura T600 and T600DLX models, which employ the 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).
Its purpose is to trap large dust and dirt particles such as: lint, hair, soil particles, etc.
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.

The alternative Unbleached Pesticide-free Cotton Pre-filter is available option for concerned air purifier users.