16x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Nutrients and Supplements ” –Ed RosenthalZero Tolerance contains

” –Ed RosenthalZero Tolerance contains only natural food-grade ingredientsOMRI certified for organic useMade with food grade essential oils100% vegan

providing optimum aeration and drainage

Apply when weeds are actively growing

11" x 197" Roll (2-pack)

Ceramic micromole output within the PAR (Photosynthetically Active Radiation) spectral range

16x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Nutrients and Supplements ” –Ed RosenthalZero Tolerance containsNordic Pure Custom MERV 14 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