18x22x1 MERV 12 Plus Carbon AC Furnace Filters 12 Pack spl_hi 5 to 1 inch in

5 to 1 inch in height from the base for 5 to 20 seconds for softwood plants and 10 to 30 seconds for hardwood plants

Several strains that release compounds that help capture iron and make it available to the plants

The lightweight aluminum handle quickly collapses down from 30-inches to 19-inches for easy storage

0 micron-sized particles such as:

• Suitable for use in damp locations

18x22x1 MERV 12 Plus Carbon AC Furnace Filters 12 Pack spl_hi 5 to 1 inch inNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.