This MERV 10 filter for use with NXT120 and NXT120C dehumidifiers. It is a larger filter specifically for the NXT120 dehumidifiers and they measure 14" x 14". It sits behind the pre-filter on your Watchdog Crawl Space Dehumidifier. The purpose of a MERV-10 filter is to help remove dirt and dust particles from the air. A MERV10 filter comes standard with your unit. It is recommended that the filter be changed about once a year. It is not washable.
The N-1201 comes in a 3 pack.