14"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 15.75"W X 17.75"H] w36h36 Measure the size of the

Measure the size of the air duct/drywall opening

Design – Cubic core eggcrate design Offers highest airflow efficiency at almost 95%

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+ Product Details Size - 18"w X 36"h is the size for the duct opening measurement only

14"W X 16"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 15.75"W X 17.75"H] w36h36 Measure the size of the+ Product Details Size 14"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" width X 17. 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