parallel plates with a gap 617 between them 643 is a notch for better coverage and flexibility and 641 is the fin at the corner of 637 for better coverage adhesion insulation and flexibility variously shown at different angles in three figures fig6 a 6 b and 6 c in one of the embodiments a rubber bulb is added around all edges of a rigid plastic sheet cut to fit inside a window frame it was intended that metal clips be used to ensure that the panel would stay in place the assembled panel was first pressed tightly inside the frame to their surprise when attempting to remove the panel from the frame it was found to be necessary to use a prying device this indicated that the use of the metal clips would unexpectedly not be required thereby greatly simplifying installation thus this embodiment is very simple practical and yet still strong however other methods can be combined here as well for example in another embodiment the panel can also be attached with glues mechanical clamps screws or spring like o rings or combinations of the above the pressure can be exerted on all sides one or more sides locally at the corners at a selected points only or by suction due to pressure difference between the two sides for example by a slight variation of the pressure on both sides the difference on the pressure can partially or fully hold the panel in place in another embodiment the panel can be in place using hangers belts chains ribbons frames railings or gap in frame of the window in another embodiment the panel can be hung through a metal or plastic rebar perpendicular to the surface of.