21_1/2x23_3/8x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack lighting use a tape measure to

use a tape measure to determine the exact width (short side) and exact height (long side) of your current air filter

- Quiet operation

OSHA compliant guards

fishing hook and 4 X match sticks

Fortified with six trace elements plus humic acid and Norwegian kelp extract to help produce heavy weight flowers and buds

21_1/2x23_3/8x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack lighting use a tape measure toNordic 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