Rocky Mountain Goods Baseboard Register Vent is the easy adjustable round flow design baseboard register that provides better airflow throughout your house. The heavy duty steel is made to last with a durawhite finish that looks new for years. An easy adjust air level allows you to smoothly and quickly change air flow. Simply measure the duct opening and ordering the size of duct opening. Rocky Mountain Goods Baseboard Register Vent comes with a lifetime warranty.