Fits Bionaire models C22, C33, W2, W2S, W6, W6S, W7, W9, W9H, W9S, W25, W0210, W0210S, W0305, W0310, W0340, W3040, and WC0840.
Bionaire foam pre-filter.
Measures approximately 9' x 9 1/4' x 1 3/4'.
For optimum performance, replace filter every 3 months.
This is an aftermarket filter.

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ASIN : B0009H602G