| 摘要 |
A window structure for use as a new or a replacement window in a wall opening is provided. This window structure includes, a tubular interior frame unit, a tubular exterior frame unit, insulating glass units, and seal means between the frame units. The tubular exterior frame unit overlaps and has substantially the same projected member width as the tubular interior frame unit for providing a slim appearance to the metal parts and for providing a large appearance to the glass parts. The tubular interior frame unit has a first tubular frame portion, and has a second flange frame portion, and has a third heat-barrier frame portion therebetween, for minimizing heat loss. Each insulating glass unit has two spaced glass sheets with a sealed air space therebetween. The seal means has a continuous primary seal member mounted on the first tubular frame portion for engaging a tubular exterior operable outswing casement frame of the tubular exterior frame unit. A horizontal bar and a vertical mullion with an upper vertical post are provided, and dual casement windows with dual fixed transom windows are provided, in the tubular exterior frame unit.
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