“Wintercurtain, long 725 cm, consisting of totally closed 12×12 Panama curtain. The curtain rolls on an aluminium tube, which is driven by a crank at the front / rear corner. The curtain can be made in one piece by the special roll-up construction. At the bottom of the curtain, a galvanized round tube with 4 straps attached to it, secured to thumbs welded under edge beams. Thumbs point forward against loosening of straps. Loops on strap large. At the bottom of the curtain a protective plate every 120 cm. Straps with 3 lashes so there can be an opening of 0, 5 or 10 cm between curtain and floor.