11_1/2x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack X Nutrients bloom It is held firmly in

It is held firmly in place using magnets

5'' x 1/3''

• Suitable for all grow systems and media

79") Ribbed bottom (

11_1/2x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack X Nutrients bloom It is held firmly inNordic 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