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- Meeting rail
- The part of a sliding glass door, a sliding window, or a hung window where two panels meet and create a weather barrier.
- Metal-clad windows
- Exterior wood parts covered with extruded aluminum or other metal, with a factory-applied finish to deter the elements.
- One millionth (10-6) of a metric meter.
- One thousandth of an inch, or 0.0254 millimeter.
- Model Energy Code (MEC)
- The Model Energy Code is cited in the 1992 U.S. Energy Policy Act (EPAct) as the baseline for residential Energy Codes in the United States. It has been succeeded by the International Energy Conservation Code (IECC) published by the International Code Council (ICC).
- A major structural vertical or horizontal member between window units or sliding glass doors.
- A secondary framing member (horizontal, vertical, or diagonal) to hold the window panes in the sash. This term is often confused with mullion.
- Muntin grilles
- Wood, plastic, or metal grids designed for a single-light sash to give the appearance of muntins in a multilight sash, but removable for ease in cleaning the window.