In 1951 r. F. Gay patented in the U.S. a system of forced circulation of heated air in all external "shells" of the building, forming a thermal coating (Thermal Envelope). Ta metoda … read on
In 1951 r. F. Gay patented in the U.S. a system of forced circulation of heated air in all external "shells" of the building, forming a thermal coating (Thermal Envelope). Ta metoda … read on