As a homeowner, you should reset the opener to prevent outsiders from opening the door with a remote that's set to a Liftmaster default code. A simple procedure allows you to reset the opener for one or more remotes.
doorsill - the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway. doorstep, threshold. 1  doorway, room access, door, threshold - the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close; he stuck his head in the doorway.
ï· A minimum of 820 square inches (5.7 square feet) of clear opening. ï· A maximum of 44 inches from the floor to the sill opening. For grade or ground floor escape windows installed on or after July 10, 2007: ï· A minimum of 20 inches in width. ï· A minimum of 20 inches in height. ï· A minimum of 648 square inches (4.5 square feet) of clear opening. ï· A maximum of 48 inches from the floor to the sill opening. Note: The above is considered the absolute minimum regardless of existing or window replacement.