8x18x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Lighting "This unit has been running

"This unit has been running non-stop in my 20x20 sealed room for six months without a single issue

• Contains a higher amount of horticultural perlite for plants that prefer greater air porosity

in turn chlorophyll is the component in photosynthesis

Canadian Sphagnum peat moss (65-75% by volume)

8x18x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Lighting "This unit has been runningNordic 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