28x28x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack additives Each Nordic Pure 1" MERV

Each Nordic Pure 1" MERV 8 furnace air filter captures airborne particles as small as 3

Iron is essential to plant growth

growers can either pick one of the existing Niwa grow recipes or create one themselves

• ETL and DLC listed

We take the highest quality coir available

28x28x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack additives Each Nordic Pure 1" MERVNordic Pure Custom MERV 7 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