611D Bionaire Air Purifier Filters (Aftermarket) Fits Bionaire models LP1000, LP1500, LP1500H and 83130. Bionaire dual air filter cartridge (Main filter + Carbon!). Measures approximately 3 1/2" x 9 7/8" x 2". For optimum performance, replace filter every 3 to 6 months or as indicated by the Filter Condition Monitor. This is an aftermarket filter.