17x28x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Extension up to 70% more than

up to 70% more than other cantilever rack shelves

Notice the "W" in the second version

OMRI Listed formula delivers visible results in under an hour — knocking down weeds and grasses so you can get back to growing what matters

2 RAW Nitrogen - 8 oz

*Tested and Verified by AHAM - Testing standard of 24 hrs at 80°F

17x28x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Extension up to 70% more thanNordic Pure Custom MERV 14 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