Grid
The specific feature and ingenuity of these solar thermic panels is the use of refrigerator grills. But beware, not all grills are good and they must be used in the right direction! The grills must be provided with cooling fins and painted black (see photo). They must not be in galvanized steel, as the paint will not adhere. Similarly, some refrigerators are equipped with pipes connected by wire, but the surface of these grids is insufficient for this use.
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