11_1/2x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack X Nutrients bloom This makes our machines easy

This makes our machines easy to use

Specification : SF-4000 new version

It is held firmly in place using magnets

Loosely fill the holes with dirt or compost

and is well-suited for hydroponic reservoirs

11_1/2x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack X Nutrients bloom This makes our machines easyNordic 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