Aftermarket Fits ReliOn humidifier model RCM-832 and RCM-832N. 2 filters per box. Measures approximately 3 3/4" x 5 1/2" x 1 1/2". High performance, high output! Honeycomb filtration to trap mineral pollutants found in water and helps prevent them from entering your home. For optimum performance, replace filter at the beginning of each season or every 2 months depending on use.