4"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 19.75"H] Grilles The first number in a

The first number in a grille size represents the width

Exceptional Craftsmanship: Hand-inspected for quality

ensuring a sleek finish

+ Product Details Size - 14"w X 20"h is the size for the duct opening measurement only

4"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 19.75"H] Grilles The first number in a+ Product Details Size 4"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 75" width X 19. 75" height. Design Easy unrestricted airflow for your HVAC system 50 angled to provide maximum airflow. High Quality Solid stamped steel with counter sunk screw holes (screws included) and no sharp edges. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed.