Solar window

A closure assembly for a building exterior surface, comprising:

• a first frame member;
• a first transparent solid sheet supported by said first frame member;
• a second frame member;
• a second transparent solid sheet supported by said second frame meber;
• means for spacing said first and second frame members and corresponding transparent sheets so that said sheets are substantially parallel and define an open volume therebetween;
• means mounted in said open volume for selectively allowing the passage of light from said first transparent sheet to said second sheet, or preventing the passage of light from said first transparent sheet to said second transparent sheet, said means comprising a pair of spaced rollers, and a sheet rolled up on said rollers, said sheet having transparent portions having substantially the same length and height as said volume between said transparent sheets and varying in transparency, and a distinct opaque portion having substantially the same length and height as said volume;
• first vent means for selectively allowing or preventing passage of air from exteriorly of said first frame member to a volume between said reflecting means and said first frame member;
• and
• second vent means for allowing passage of air from within the volume between said reflecting means and said first frame member to a remote area.