17_1/4x17_1/4x1 Exact MERV 14 AC Furnace Filters 6 Pack leds Comes with a Cool tube

Comes with a Cool tube design for heat control

Potential nutrient lock-up can be avoided by adding the Micro before the Bloom and Grow

Since you can't return custom sized air filters

Outside Dimensions: 35 3/4" x 35 3/4" x 3 3/4"

tubers or any other part that comes in contact with the soil

17_1/4x17_1/4x1 Exact MERV 14 AC Furnace Filters 6 Pack leds Comes with a Cool tubeNordic Pure MERV 14 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 14 furnace filters are comparable to HVAC filters with the rating of MPR 2800.