Fellowes AeraMax Pro Pre-filters for use with AeraMax PRO AM 3/3S & 4/4S Air Purifiers, Pack of 4 Filters

The pre-filters capture larger particulate to help extend life of subsequent filters. Estimated life depends on level of particulates but should be changed with carbon filter. Pre-filters capture large particulates like dust and hair and keep carbon filters working effectively Estimated life depends on level of particulates but should be changed with carbon filter Prefilters can be changed more frequently in high particulate environments Compatible with all variants of AeraMax Pro AM 3 and AM4 Air Purifiers 4 pack - includes 4 single pre-filters