A 90 degree end register boot is made to easily transit airflow from a round flexible or hard duct to a rectangular register or vent with a 90 degrees turn. The boot can be fastened to other ducts, including ceiling and wall units, using a nail and screw. 90 degree end register boot available in size for round inlet from 4” to 8”, for rectangular outlet from 2-1/4” x 10” to 6” x 14” and more sizes available for customer request. These boots are made of 26 gauge galvanized sheet metal up to 12″ or 24 gauge galvanized sheet metal from 14″ to 24″.