11_1/2x11_1/2x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Lighting Designed for long-term use and

Designed for long-term use and low maintenance

greatly reducing the risk of phytotoxic effects

reliable EC/TDS meter on the market

or add it to existing soil

11_1/2x11_1/2x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Lighting Designed for long-term use andNordic 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