8x18x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack air-purification this formula is very effective

this formula is very effective for supplementing calcium

membranes and other biochemical processes

Maintaining an optimal temperature for components prevents overheating

When the standard value is recognized and stability reached

8x18x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack air-purification this formula is very effectiveNordic 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