16x28x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack fluorescent-lighting Made from high-quality Carborundum and

Made from high-quality Carborundum and ceramic materials fired at 1350°C

Reduces the chance for overwatering

The small batch production of this machine is best suited for personal runs or test batches of a new material source

and up to six fans can share the same thermal controller or wall outlet power source

Hangs 3 ways—overhead

16x28x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack fluorescent-lighting Made from high-quality Carborundum 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