This "Compatible" Crosley humidifier filter belt (evaporator pad) for portable 9" drum-types. Fits Crosley humidifier model C4004. Measures approximately 9 1/2" x 24" x 1/4". For optimum performance, replace filter twice a season. Use Humidifier Water Treatment to eliminate lime scale build-up on your tank and filter to insure longer trouble free performance for your humidifier.