16_3/8x21_3/8x1 Exact MERV 13 AC Furnace Filters 6 Pack Water Treatment Week 1 – 10-12ml per

Week 1 – 10-12ml per gallon

Ducting Port Quantity: 8 (11" Double Cinching)

Pre-punched drainage holes

This mat fits perfectly underneath the two greenhouses

Made from OMRI Listed Worm Castings

16_3/8x21_3/8x1 Exact MERV 13 AC Furnace Filters 6 Pack Water Treatment Week 1 – 10-12ml perNordic 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