21_1/2x23_5/16x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Commercial Lighting depending on whether you have

depending on whether you have a dedicated room for drying

MERV 8 furnace air conditioning filters are comparable to HVAC filters with the rating of MPR 1000

Big enough to grow a large plant for its entire life

Case of 6 PK

21_1/2x23_5/16x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Commercial Lighting depending on whether you haveNordic Pure Custom MERV 8 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition