marine glazing
a U-channel of soft PVC which is wrapped around the edge of the glass, cushioning the glass against the aluminum or vinyl. This process allows for unrestricted expansion and contraction and watertightness.
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meeting rail
the part of a hung window where the two sash meet and create a weather barrier.
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meeting stile
the part of a sliding window where the two sash meet and create a weather barrier.
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mill finish
the original finish produced on aluminum by extruding.
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missle impact
testing performed on windows to simulate the ability for a window frame and its glazing material to resist hurricane-driven debris.
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monolithic
a single lite or pane of glass.
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mullion
an extrusion that joins windows.
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mullion cover
an extrusion that joins panning perimeter legs that extend over existing mullions.
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muntin
extrusions in the sash which are exterior (outside of the glass exterior face), internal (within the insulating glass airspace), or true (dividing the glass) which appear to or actually divide the glass into smaller lites.
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