dual rollout thermo pane window with indian shutter is depicted below the return air duct from the interior exterior of the enclosed west gable end showing the return air attic vent in heat mode with insulated plug installed silver and the dual pane window installation from the exterior details of indian shuttered window treatment white rectangles show the location of additional windows fig1 a shows return air mode and fig1 b with the insulating plug removed it is in vent mode detail of return air ducting rafter purlin with queen butt and swingle collar tie joinery with slots for ship lapped floor ceiling boards uninstalled detail of single rollout thermo pane window with its indian shutter cut from the skin to the precise dimension of the window claim one turbine ventilator has been rotated outward to show the insulated thermal plug installation for heat mode claim the insulated plug has been removed allowing the integral sleeve black to slide down sealing the duct to the turbine ventilator in vent mode claim shows joinery and where the ship lapped uninstalled interior wood curtain walls will insert into the pre slotted bent frame and butt against the concrete bathroom floor partial installation of interior wall boards butted against the bathroom floor a loose floor board is angled toward the wall boards and when installed will lock the wood curtain wall into place ship lapped floor.