Syed A Rahman

US Patent:

40086550, Feb 22, 1977

Filed:

Nov 17, 1975

Appl. No.:

5/632213

Inventors:

Syed A. Rahman - Sparta NJ

International Classification:

E04F 1704

US Classification:

98 46

Abstract:

An improved chimney stack of the type having at least one flue through which gases flow and an outer shell for establishing an insulating space surrounding the flue wherein the present improvement includes heat exchanger means secured to the flue and having first and second ports with the first port extending through the outer shell and communicating with the outside air and with the second port communicating with the insulating space surrounding the flue and wherein the heat exchanger means admits and heats outside air and discharges heated outside air into the insulating space surrounding the flue during cool down of the chimney stack whereby minimization of condensation of flue gasses during cool down of the chimney stack is achieved.