14x18x1 Exact MERV 13 AC Furnace Filters 6 Pack cloning-and-seed-starting 5 lbs 25¼” x 19¾”

5 lbs 25¼” x 19¾” x 10¾” 17

these units are perfect for both residential and hydroponic applications

Rock SuperCharge incorporates years of research into keeping roots healthy and strong

all while the Gro-Block Improved maintains its structure

14x18x1 Exact MERV 13 AC Furnace Filters 6 Pack cloning-and-seed-starting 5 lbs 25¼” x 19¾”Nordic Pure MERV 13 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 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200