AirPura Standard Pre-Filter is AirPura Polyester based woven Pre-filter pack of 2 for AirPura portable air purifiers.
AirPura standard Pre-filter is a 1-inch thick polyester based woven filter with effective surface area of 570 square inches.
The pre-filter forms the first stage of air filtration system in all models of AirPura Portable air purifiers.
The exception is AirPura T600 and T600DLX models, which employs the AirPura special Tar-barrier pre-filter.
The purpose of the pre-filter is to trap large dust and dirt particles, lint, hair and protect fine True HEPA filter from faster contamination and extend its lifetime.
The pre-filter covers the entire internal surface of the polluted air intake.
Pre-filter can be vacuumed right through the metal mesh with a soft brush and easily replaced with new one when it gets very dirty or ruined.
The pre-filter's lifetime - up to 12 months (under normal residential conditions).

The chemically inert Unbleached Pesticide-free Cotton Pre-filter is available instead of the Standard one for chemically sensitive individuals.