21x21x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack spl_magfan - 2911 RPM

- 2911 RPM

Foliar nutrient spray

sensors and light adapters to be connected to the TrolMaster controllers

Replace if soiled or spores are present on the filter after harvest

21x21x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack spl_magfan - 2911 RPMNordic Pure Custom MERV 8 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