23x25x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack trays The system blocks light and

The system blocks light and keeps the top of your medium moist for a more even dry down

48 strips per case

which is the perfect amount to stick 50 cuttings

a human hair is about 70 microns wide

Once ingested

23x25x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack trays The system blocks light andNordic 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