17_1/4x17_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Paleo Bloom These Gorilla strong poles will

These Gorilla strong poles will get you back to growing in no time

Rubber gasket pre-installed on exterior for an air tight seal

Greenhouses

High-grade carbon steel construction prevents stripping

Commercial Market Grower

17_1/4x17_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Paleo Bloom These Gorilla strong poles willNordic Pure Custom MERV 13 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