12" X 4" Floor Register with Louvered Design - Heavy Duty Rigid Floor Air Supply with Damper & Lever - Brown steel 2 recessed screw holes on

2 recessed screw holes on each side with screws included

and the second number represents the height

ensuring consistent and efficient air distribution throughout your space

Actual Filter Size – 11 3/4"w x 9 3/4" x 1"

If you still have the fiberglass low quality filter that is below MERV 4

12" X 4" Floor Register with Louvered Design - Heavy Duty Rigid Floor Air Supply with Damper & Lever - Brown steel 2 recessed screw holes on+ Product Details Size 12"w X 4"h or 4"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 5" X 5. 5" wider. High Quality Extra Heavy Duty to withstand constant walk on situations. Installation Location Floor. Design Rigid gauge built for durability and long life in mind, but still light and handy. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just