21_1/2x23_3/8x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack house and garden soil edge's groundbreaking design is the

edge's groundbreaking design is the culmination of Hanna's vision

KIND Grow is designed for the vegetative period of the growth cycle

NOTE: Remove filters and use nozzles with a minimum of 18 mesh (1 mm) openings to avoid clogging

32 pH-balanced plugs

1770 PPF High Output to replace even 1000W DE

21_1/2x23_3/8x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack house and garden soil edge's groundbreaking design is theNordic 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