Fits 15" Floor Corner Baseboard Register 15" External Length Register Vent Cover Grille Adjustable Lever for Air Flow Control with Matte Black Powder Coating The Listed size 12"x 8"

The Listed size 12"x 8" is for inside duct opening measurement (the duct hole)

This register fits in a duct opening of 14”wide and 8”high

Select the listed size that match the duct opening size

The listed size 10" x 6" is for the inside duct opening measurement

If your duct opening size is 12” x 4”

Fits 15" Floor Corner Baseboard Register 15" External Length Register Vent Cover Grille Adjustable Lever for Air Flow Control with Matte Black Powder Coating The Listed size 12"x 8"15" long heavy duty steel construction with matte black 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