Dead air space: the space between the panes of double or triple-glazed window panes.
Dessicant: moisture-absorbing material used between the panes of insulating glass.
Double glazing: a pane assembly consisting of two panes of glass with a sealed space in between. The air in this space has been dried to prevent condensation. Sometimes the space is filled with argon or krypton for reduced heat transfer.
Double-hung window: a window with two moveable sashes, the top one opens downward, the bottom one upward.
Drip cap is a piece of molding or other material located on top of the head brick molding to prevent water infiltration.
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