8_1/2x30x1 Exact MERV 14 AC Furnace Filters 6 Pack Ventilation ) | Airflow: 51 CFM

) | Airflow: 51 CFM | Noise: 16 to 38 dBA

and top/side application

becoming thick and healthy instead of circling the inside of the pot and becoming root bound

Weight: 15 lbs

This is especially useful when the substrate blocks are placed on cultivation tables and concrete floors

8_1/2x30x1 Exact MERV 14 AC Furnace Filters 6 Pack Ventilation ) | Airflow: 51 CFMNordic Pure MERV 14 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 14 furnace filters are comparable to HVAC filters with the rating of MPR 2800.