The new Air-O-Swiss Ultrasonic U7142 dual warm and cool mist humidifier quietly and quickly humidifies a room size of up to 860 sq. ft.

Fits Air-O-Swiss Humidifiers: AOS 7131, AOS 7133, AOS 7135, AOS U-7142. Each cartridge lasts 2-3 months.

Fits Air-O-Swiss Models: AOS 7131, AOS 7133, AOS 7135, AOS U-7142, AOS 1355, AOS 2055, AOS 2055-D. Replace once per year.

For use in all Air-O-Swiss ultrasonic humidifiers, including: AOS 7131, AOS 7133, AOS 7135, AOS U-7142. Contains three refill packs for Air-O-Swiss Demineralization Cartridge 7531

For all humidifiers: Ideal for routine maintenance and cleaning on most humidifier brands.