12"W X 10"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 13.875"W X 11.875"H] w36h36 our Butterfly Damper simplifies the

our Butterfly Damper simplifies the process of managing airflow

actual front end outer dimensions are approximately 33

Pre-flared ends with nuts are for simple and easy installation

Universal Fit – With dimensions of 4-1/8" wide x 7-1/16" high x 2-1/8"

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

12"W X 10"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 13.875"W X 11.875"H] w36h36 our Butterfly Damper simplifies the+ Product Details Size 12"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 875" width X 11. 875" height. High Quality High quality aluminum with counter sunk screw holes (screws included) and no sharp edges. Design Unrestricted airflow For Your HVAC system noise free components no vibrating louvers etc. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was