21x21x1 HVAC Furnace Air Filters. Exact Measurements: 20-1/2 x 20-1/2 x 3/4.Filtration Rating: MERV 8 | FPR 5 | MPR 600. Installing our 21x21x1 MERV 8 HVAC Filters into your air conditioner or furnace can greatly reduce the number of airborne particles from contaminating your indoor air quality where you live or work. The MERV 8 HVAC Filters will efficiently improve the air quality in your environment. By using and changing your filters regularly, your energy costs can be reduced, while providing clean and healthy air for your family and colleagues. MERV 8 Description: Engineered and designed for high strength and rigidity Pleat consistency optimizes performance Defends from Lint, Dust, Pet Dander, Pollen, Dust Mites, & Mold Available several standard face sizes Independently tested and verified for quality control 100% synthetic, proprietary media resists moisture and damage Very low pressure drops and maximum dust holding capacity Heavy duty, moisture resistant beverage board frame Two-piece frame provides rigidity with double-wall thickness around outer edge Rust-resistant, expanded metal support grid made of galvanized steel 100% water repellent, high-strength adhesive coats entire interior of frame Recommended to replace at least every 90 days Manufactured in the USA
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