Bionaire Electret main replacement air filter
- Fits Bionaire models BT204, BT400, BT500, BT500s, and BT501.
- For removal of dust, smoke particles, pollen, and bacteria.
- For optimum performance, replace filter every 3 to 6 months.
- Filter measures 22 1/2" x 4".
This is an Aftermarket filter
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