Floor Corner Base Board Register with Adjustable Air Flow Control Lever Come with Selected Color and Finish (White - 24inch) actual overall outside dimension is

actual overall outside dimension is 18

Distance between the centers of two screws is 14

Sidewall/Ceiling Register Measurement

actual outsize overall dimensions is 10“ wide by 8” high

The Listed size 20"x12" is for inside duct opening measurement

Floor Corner Base Board Register with Adjustable Air Flow Control Lever Come with Selected Color and Finish (White - 24inch) actual overall outside dimension is24" long heavy duty steel construction with white powder coating finish Simple round flow design for smooth air flow Easy adjust air flow control with central lever Removable faceplate allows easy cleaning Independent cardboard packing for extra protection