8x18x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Commercial Lighting Biomin Iron is a 5

Biomin Iron is a 5

Citric Acid and Potassium Sorbate

Specially designed for controlling the speed of inline

& Alkalinity (mg CaCO3/L)

and higher yields

8x18x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Commercial Lighting Biomin Iron is a 5Nordic Pure Custom MERV 13 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