Passive and no-loss weather cap for protection of wind induced downdraft in sensitive exhaust systems

A method for removing heat from a building through an existing flue, the method comprising:

• a) directing a heat-containing exhaust emanating from the flue, defining a first inner diameter, to an inner tubular member slidably received by the flue, wherein the inner tubular member has a superior end positioned in a downstream direction from a terminating end of the flue;
• b) contacting the directed exhaust to a symmetrical, double conic body which is positioned downstream from the superior end of the inner tubular member and upstream of a superior end of an outer tubular member, so as to form the directed exhaust into a slipstream, wherein the slipstream imposes laterally-directed forces to any precipitation entering the superior end of the outer tubular member, a flange dimensioned to extend over at least a portion of the periphery of the existing flue so as to aid in supporting the device on the flue;
• the flange comprising of at least one strut, wherein the at least one strut comprises of two arms which, respectively, each extend above and below the terminating end of the flue;
• wherein the outer tubular member is coaxial with and encircles the superior end of the inner tubular member and wherein the outer tubular member is straight and devoid of medially protruding portions downstream of the symmetrical double conic body so as to define a chimney cross section;
• and c) routing precipitation entering the outer tubular member to a periphery of said outer tubular member.