The Austin Air HM400 HealthMate Air Purifier Filter is a white tower-style air purifier from the reputable brand Austin Air. It features quiet operation and is designed to effectively clean and improve indoor air quality. The Austin Air HealthMate HM 400 model is a reliable choice for those looking to enhance the air quality in their home or garden. I will add a photo of the filter inside ASAP Hello here are the photos of inside the unit. I washed the filters white wrap around the liner cover.  I also used my leaf blower to blow out the filter. I do not know how old the filter is.