14" x 26" or 26" x 14" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in Crafted from high-quality red oak Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Crafted from high-quality red oak wood

+ Product Details Size - 12"w X 18"h is the size for the duct opening measurement only

And Meets/Beats ASTM B280 Standard

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 28" duct opening (measured at the opening)

+ Product Details Size – 18"w X 32"h is the size for the duct opening measurement only

14" x 26" or 26" x 14" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in Crafted from high quality red oak Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Crafted from high quality red oak wood + Product Details Size 12"w X 18"h is the size for the duct opening measurement only