18"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 37.75"H] Insulated Line Set 5" width x 13

5" width x 13

1/4" - 6518 PSI

Crafted meticulously from high-quality steel

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

3 * insulation density is 30kgs/cbm = 0

18"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 37.75"H] Insulated Line Set 5" width x 13+ Product Details Size 18"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 37. 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