11_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Pumps & Irrigation even when applied at recommended

even when applied at recommended rates

Trinity is a distinctive formula of complex carbohydrates with soy protein and humic acid extracts combined to encourage plant growth and vigor

Perfect for growing salads and herbs or for early season seed starting

the Max Fan has the power to move air efficiently

--> Made of galvanized steel

11_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Pumps & Irrigation even when applied at recommendedNordic 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