12" X 16" or 16" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 17.75] #REF! 75" width X 33

75" width X 33

or to regulate it for room-by-room temperature and climate control

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

wall-mounted ducts

Design – The product is designed to convert ductwork into a vent to heat a room

12" X 16" or 16" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 17.75] #REF! 75" width X 33+ Product Details Size 12"w X 16"h or 16" X 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 17. 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