12"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 13.75"W X 19.75"H] w8h8 Installing a collar is the

Installing a collar is the first step when installing the system of ducts

Actual Filter Size – 7 3/4"w x 35 3/4" x 1"

+ Product Details Efficient Condensate Removal - HVAC Condensate Removal Pump With Automatic Switch – Automatically scans

These are specially sized to fit into all drop cielings

12"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 13.75"W X 19.75"H] w8h8 Installing a collar is the+ Product Details Size 12"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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