16_1/4x21_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Water Treatment dried by thermal dehydration to

dried by thermal dehydration to 9% moisture content and contains no detectable pathogens

HYDROPONICS AND AQUAPONICS: Ideal inert substrate for hydroponic and aquaponic crops

hard plastic

• Dimensions: 9” tall

16_1/4x21_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Water Treatment dried by thermal dehydration toNordic Pure Custom MERV 13 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