17_1/2x21x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack lighting-accessories Made from high-density polyethylene

Made from high-density polyethylene

Prevents stratification of grow room air

It uses professional grade aluminum that resists most conditions including extreme temperatures

Whether you're running a sealed grow room

this spray can be used without worry anywhere you have unwanted grass or weeds

17_1/2x21x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack lighting-accessories Made from high-density polyethyleneNordic 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