Warm-edge technology: use of a low-conductance spacer near the edge of insulated panes to reduce heat transfer.

Weatherstripping: a flexible strip used to keep water from infiltrating the building, and to reduce air leakage.

Weep hole: a small hole in a window sill that allows water to drain to the outside.

Wind load: the force against a surface caused by moving air.

Windowpane divider: narrow strip of wood or other material that holds individual glass panes. Also called a muntin.

Wind-borne Debris Region: a coastal area subject to hurricanes or any area subject to high winds exceeding 120 mph.

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