20_1/2x25_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack post harvest Carefully processed and sifted to

Carefully processed and sifted to make it easy to work with

Contains specialized amino acids and betaines

Each time air passes through a Nordic Pure carbon pleated furnace filter

0 Mega-Pixel camera to catalog and track progress and species

After entering the value of the desired amount of PPFD to HCS-3

20_1/2x25_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack post harvest Carefully processed and sifted toNordic 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