20x24x4 (3 5/8) Pleated MERV 15 Air Filters 1 Pack Reflectors & Grow Lights Outer Dimensions: 3/8''

Outer Dimensions: 3/8''

DESIGNED TO WORK WITH B-Lite Master Zone Controller (Not Included)

RootShield Plus is also available in a granular formulation

Can also use as a foliar at the same rate 2-4 times per week

Heavy duty construction with galvanized steel

20x24x4 (3 5/8) Pleated MERV 15 Air Filters 1 Pack Reflectors & Grow Lights Outer Dimensions: 3/8''Nordic Pure 20x24x4 Pleated Air Filters MERV 15 are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, smoke particles, smog, allergens, virus carriers, bacteria, mold spores and other contaminants are removed. All Nordic Pure pleated air filters are manufactured