17_1/2x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack pumps-and-irrigation-supplies Taped seams (blue tape) provide

Taped seams (blue tape) provide superior protection to coveralls made with serged seams that are exposed

Made to be tough for the task at hand

Decreases premature flower aging

The microbial mixture in ROOT helps plants:

lumen output and irradiance

17_1/2x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack pumps-and-irrigation-supplies Taped seams (blue tape) provideNordic 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