Andrew Stewart Robertson
Physician at Leland Dr, Lafayette, CA
License number
Colorado 22361
Issued Date
Jun 5, 1979
Renew Date
Dec 31, 1980
Expiration Date
Dec 31, 1980
Type
Physician
Address
Address
1034 Leland Dr, Lafayette, CA 94549
Professional information
Heating System
US Patent:
4736730, Apr 12, 1988
Filed:
Aug 25, 1987
Appl. No.:
7/089928
Inventors:
Andrew S. Robertson - Lafayette CA
International Classification:
F24B 700
US Classification:
126123
Abstract:
A heating system comprising a firebox defining a combustion chamber that is substantially sealed from the atmosphere. The system includes a flue for conducting combustion gases from the combustion chamber. A first duct surrounds the flue and defines an inner passageway with respect thereto. A second duct surrounds the first duct and defines an outer passageway. An inlet means is provided for introducing ambient air into the outer passageway. The air in the outer passageway is drawn through the inner passageway by a negative pressure in the combustion chamber. The ambient air in the inner and outer passageways is heated by heat transmitted from the flue. This heated ambient air is then introduced in the combustion chamber to improve the efficiency of combustion.