17_1/2x21x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack lighting-accessories Spray application is suggested for

Spray application is suggested for those diseases affecting leaves

(2) channel scrub brushes

Made from high-density polyethylene

Whether you're running a sealed grow room

17_1/2x21x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack lighting-accessories Spray application is suggested forNordic 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