8x18x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Commercial Lighting Pre-Mix Is a dry fertilizer

Pre-Mix Is a dry fertilizer comprised of 100% natural ingredients derived from organic matter

Citric Acid and Potassium Sorbate

Specially designed for controlling the speed of inline

and higher yields

Heavy duty float switches dictate when and where water flows

8x18x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Commercial Lighting Pre-Mix Is a dry fertilizerNordic 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