12x20x2 Furnace Air Filters MERV 12 Pleated Plus Carbon 3 Pack microbes Compatible with: Pots 6L -

Compatible with: Pots 6L - 7''x7''x9''

Lower the pH of soil less media

The butterfly damper blades are made of aluminum and are equipped with a light spring that folds with minimal airflow

MERV 12 Plus Carbon air filters are comparable to air filters with the MPR rating of 1500-1900

12x20x2 Furnace Air Filters MERV 12 Pleated Plus Carbon 3 Pack microbes Compatible with: Pots 6L -Nordic Pure 12x20x2 MERV 12 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer. This results in less flow restriction and 33% more surface area for cleaner smelling air. It will help eliminate unwanted odors as well as trap most airborne dust and particulate matter for fresh, clean air. Odorous gases and vapors (VOC) are attracted to and held by the activated carbon material