◆Frame design allows exterior trim to cover the frame
◆Optional hidden window frame for narrow field of view
◆Optional seamless welded aluminum corners
◆Up to 300 custom colors available
◆Each operable unit has three layers of airtight gaskets
◆R-9's standard glass kit is standard on all units
◆The adjustable range of solar heat coefficient is 0.28～0.60 (standard value is 0.54)