13_1/4x13_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack complete-systems Two-way humidity control means the

Two-way humidity control means the pack both adds moisture when the environment is too dry and absorbs moisture when it's too humid — actively maintaining the target 62% RH rather than simply drying the air like a one-way desiccant

While Green Cleaner treats the foliage above ground

and weed density

*Not labeled for use on these in California

Overall length of 8-inch

13_1/4x13_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack complete-systems Two-way humidity control means theNordic 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