12" X 18" Or 18" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 19.75] tools + Product Details Size -

+ Product Details Size - 24"w X 16"h X 2"d (for duct opening measurement only)

crafted from high-quality galvanized sheet metal for unparalleled durability and rust prevention

+ Product Details 16" x 20" x 1" replacement air filters for your furnace

Universal Heavy Duty – Fits virtually any air conditioning mini split unit

+ Product Details Size & Compatibilty - The 18" to 16" round metal pipe reducer & increaser 30 gauge is compatible with duct 18" to 16"

12" X 18" Or 18" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 19.75] tools + Product Details Size -+ Product Details Size 12"w X 18"h or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 19. 75" height. High Quality High grade steel construction meant for high foot traffic areas. Installation Location Floor. Design Easy drop in installation. Powder Coat Finish Smooth, shiny, scratch resistant, with no sharp edges. Looks like it was just waxed. Quality Packaging Carefully