15_1/4x15_1/4x1 Exact MERV 13 AC Furnace Filters 6 Pack cloning-&-seed-starting Storm flap over zipper adds

Storm flap over zipper adds an extra layer of protection

Duct Size 4″

Double junction pH electrode with 2m cable (BNC connector)

Dent-proof

The result is a replenished natural microbial system on the roots of inoculated plants that increases crop productivity

15_1/4x15_1/4x1 Exact MERV 13 AC Furnace Filters 6 Pack cloning-&-seed-starting Storm flap over zipper addsNordic 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