13x18x1 Exact MERV 10 AC Furnace Filters 6 Pack grow-light-ballasts The 11 lbs cube expands

The 11 lbs cube expands quickly to over 2 ½ cu ft of a rich growing medium

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The bags are tear and puncture resistant and durable enough to simmer in water and use in the microwave

13x18x1 Exact MERV 10 AC Furnace Filters 6 Pack grow-light-ballasts The 11 lbs cube expandsNordic Pure MERV 10 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, allergens and other contaminants are removed. MERV 10 furnace filters are comparable to HVAC filters with the rating of MPR 900 1000. While different companies