Allergen Defense Red Micro Pleated Air Furnace Filter, 20x30x1-In. Lenox 37" circumference is more accurate

37" circumference is more accurate over rough surfaces

Dimensions: 36" x 5'

Heavy Duty Stand Fan is designed for industrial

lasts up to 3 months

Ideal for transmission fluid

Allergen Defense Red Micro Pleated Air Furnace Filter, 20x30x1-In. Lenox 37" circumference is more accurate20" x 30" x 1", Red, Micro Allergen Filtrete Filter, 90% Effective At Capturing Large Allergens Like Mold Spores & Pet Dander, Captures Microscopic Allergens Like Dust, Smoke & Smog, Captures Bacteria & Particles That Can Carry Viruses, Meets The Guidelines Of The American Lung Association Health House Program. MPR Rating 1000, Filter Lasts For 90 Days, Color Red