16" X 18" or 18" x 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 19.75] Round Duct Pipe + Product Details Size -

+ Product Details Size - 26"w X 26"h is the size for the duct opening measurement only

you can attain the diameter of the vent

Applications – 2 Gauge thick & made of thick & durable galvanized sheet metal - used for HVAC system duct work in any building or home including: round exhaust air duct systems for dryers

+ Product Details Size - 30"w X 8"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size - 14" X 14" is the size for the duct opening measurement only

16" X 18" or 18" x 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 19.75] Round Duct Pipe + Product Details Size -+ Product Details Size 16"w X 18"h or 18" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 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