Frost barrier and vent

Claim 1

A SIDE AND COVER HOLLOW PANEL WALL CORNER STRUCTURE COMPRISING SIDE AND COVER HOLLOW PANEL WALLS EACH HAVING INNER AND OUTER SIDES WITH HOLLOW SPACES FORMING VENTILATING PASSAGES BETWEEN THEM, A COVER SUPPORT EXTRUSION FOR SAID CORNER STRUCTURE HAVING A BASE FLANGE MOUNTED OVER THE UPPER EDGE OF THE OUTER SIDE OF THE SIDE PANEL WALL, AND AN UPPER FLANGE SUPPORTING THE COVER PANEL WALL AT THE OUTER SIDE THEREOF, SAID BASE FLANGE BEING PERFORATED OVER THE HOLLOW SPACE PORTIONS IN SAID OUTER SIDE OF THE SIDE PANEL WALL, SAID SUPPORT EXTRUSION HAVING A WEB EXTENDING DOWNWARDLY FROM THE INNER EDGE OF ITS BASE FLANGE AND THEN BEING TURNED UPWARDLY AND EXTENDING TO THE OUTER EDGE OF SAID UPPER FLANGE, A PERFORATED CLIP FASTENED OVER SAID BASE FLANGE AND HAVING A LEDGE EXTENDING OVER ITS OUTER EDGE HOLDING THE TOP OF SAID OUTER SIDE OF THE SIDE PANEL WALL IN PLACE UNDER SAID BASE FLANGE AGAINST SAID DOWNWARDLY EXTENDING PORTION OF SAID WEB, SAID WEB HAVING A CHANNEL FLANGE EXTENDING FROM ITS SIDE, A SPRING CLIP HAVING AN UPPER PLATE PORTION ATTACHED TO SAID OUTER SIDE OF THE COVER PANEL WALL AND HAVING A HOOKED LOWER EDGE SPRUNG OVER THE LOWER EDGE OF SAID CHANNEL FLANGE, THEREBY FIXING THE COVER PANEL WALL OVER SAID UPPER FLANGE, THE INNER SIDES OF SAID SIDE AND COVER WALLS BEING TERMINATED SHORT OF THEIR RESPECTIVE OUTER SIDES AND OF SAID SUPPORT EXTRUSION SO THAT THEIR EDGES ARE CLOSELY SPACED FROM EACH OHER AND FROM SAID SUPPORT EXTRUSION AT THE CORNER OF THE STRUCTURE, AND A RESILIENT SEALING STRIP MOUNTED BETWEEN SAID CLOSELY SPACED INNER SIDE EDGES AND SPACED FROM SAID SUPPORT EXTRUSION TO FORM A PASSAGE WITH THE INSIDE OF SAID SUPPORT EXTRUSION EXTENDING BETWEEN THE VENTILATING PASSAGES OF THE SIDE AND COVER PANEL WALLS.