21_1/4x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Ventilation/Air Conditioning Carbohydrates supply microbes with a

Carbohydrates supply microbes with a vital source of food they need to thrive in your plants’ root zone

Anti-Drip Properties

217C is made up of 100% pure rosemary botanical extracts and is highly water soluble

Move table's contents more easily and prevent spills

high-impact upgrade for any serious grow operation

21_1/4x23_1/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Ventilation/Air Conditioning Carbohydrates supply microbes with aNordic Pure Custom MERV 12 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