8_1/2x30x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack hand-tools The high quality ingredients in

The high quality ingredients in this two-part nutrient combo (GROW A 3-0-2

Clean and consistent results

In contrast to phosphate

Ducting Port Diameter: 10″ Double Cinching

8_1/2x30x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack hand-tools The high quality ingredients inNordic Pure Custom MERV 8 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