711D Bionaire Air Purifier Filters (Aftermarket) Fits Bionaire models F70&#44; F70FW&#44; F70S&#44; F70T&#44; F70W&#44; F75&#44; F100&#44; F100S&#44; Measures approximately 5 5&#47;8 x 7 1&#47;4 x 4 7&#47;8 in. For optimum performance&#44; replace filter every 3 to 6 months or as indicated by the Filter Condition Package Quantity: 1 Excellent Quality.