20x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack commercial-greenhouse-fixtures Perfect for 4’x4’ vegetative coverage

Perfect for 4’x4’ vegetative coverage at 18”and 3’x3’ flowering coverage at 6”-12”

row crops and houseplants

and helps dry fabrics faster

encouraging their arrival

Always at an industry leading 1:1 ratio

20x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack commercial-greenhouse-fixtures Perfect for 4’x4’ vegetative coverageNordic Pure Custom MERV 10 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