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.
A mullion is a type of cabinet door that features glass panels rather than solid wood. The glass panels have dividing bars similar to those found in window panes.A mullion is a cabinet door that is composed of glass panes. The panes are separated by wood or aluminum strips, which create a grid.This mimics the feature that is found on many types of windows. mullion is a cabinet door that is composed of glass panes. The panes are separated by wood or aluminum strips, which create a grid. This mimics the feature that is found on many types of windows.