17_1/4x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Electrical Components High accuracy +/- 30ppm/0

High accuracy +/- 30ppm/0

Flame is very effective in both Soil and Hydroponic gardens

The Xtrasun II Wing Reflector offers excellent performance at a cost-effective price

Shoe covers protect against liquids and particulates

As first in the industry

17_1/4x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Electrical Components High accuracy +/- 30ppm/0Nordic Pure Custom MERV 12 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