16_1/4x21_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack X Nutrients bloom Nordic Pure 12x24x4 MERV 10

Nordic Pure 12x24x4 MERV 10 Pleated Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

Outside Diameter: 9"

Use throughout the entire growing process

Foliar Application:

16_1/4x21_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack X Nutrients bloom Nordic Pure 12x24x4 MERV 10Nordic 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