Heat insulated metal roller shutter case - has narrow sections in blind slot area, and cord hole in another side

摘要

One of the peripheral sides esp. of metal, at right angles to each other, has an elongated slit aperture for the shutter screen, and a hole for the belt, in a case accommodating the winding spindle for a roller shutter. The width of the case in the plane of the slit for the blind is less than 20 cm. Another sidewall - not the one containing the slit - is fitted with the hole for passage of the belt. This may be the sidewall sited on the interior side when the case is built in. The hole can be several cm. high and wide. Heat loss at the top of the window or door is reduced.