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

A device for removing heat from a building through an existing flue defining a periphery, the device comprising:

• a. a first tubular member defining a first cavity, the first tubular member slidably received by the flue, wherein the first tubular member has a superior end positioned in a downstream direction from a terminating end of the flue;
• b. a second tubular member defining a second cavity, whereby said second tubular member resides within the first cavity and is coaxial to the first tubular member such that the first tubular member is coaxial with and encircles the superior end of the second tubular member;
• c. a double conic body coaxially residing in the first cavity and coaxially positioned with the second tubular member, wherein the first tubular member is straight and devoid of medially protruding portions downstream of the double conic body so as to define a chimney cross section;
• and
• d. 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.