Achieve maximum performance and long-lasting use with the American Louver Company Stratus white eggcrate return grille STR-ERFG-6W. This return filter is made of durable, engineered polymers and stainless steel screws, designed to resist rust, corrosion, yellowing or fading, and mildew. The polymer itself is natively white and therefore without paint, negating the need to repaint this diffuser. The strong design maintains integrity and will not bend or scratch, despite being 50% lighter than its metal competitors. This eggcrate return grille is exceptionally easy to install. It fits 6" x 6" square ducts. The hinged grille face drops down to conveniently change or clean the filter, which can be done with the use of a commercial dishwasher. Free of sharp edges and drop-resistant, mating this diffuser on compatible standard-size air ducts is a worry-free experience. The extra tall 2 3/8" neck with molded-in duct tabs make it easier to affix this diffuser to existing duct systems. This item has a consistently smooth finish and will not show scratches or score marks during install. The polymer construction of this grille contributes to its high-level performance. The plastic is antistatic, so dust and lint won't collect on the grille and spread allergens. The polymer also resists sweating, which will prevent moisture and condensation build-up. This not only makes the grille easier to maintain, but functionally resists mildew and other mold growth on the product. Its air flow capabilities are consistent with metal and it's flame spread resistant, keeping your air ducts safe. Overall Dimensions: Length: 23 3/4" Width: 23 3/4" Depth: 2 1/8" Cell Size: 1/2" x 1/2" x 1/2" Duct Size: 10"