16x21x1 MERV 7 AC Furnace Filters 6 Pack growing-media There are four precision thermal

There are four precision thermal probes included

organized trimming workspace

even distribution by hand or spreader across large areas

plant roots will grow under and through the Mats where moisture remains between flood cycles

Integrated double-jacketed design allows lamp to be open rated

16x21x1 MERV 7 AC Furnace Filters 6 Pack growing-media There are four precision thermalNordic Pure MERV 7 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 and other contaminants are removed. MERV 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters