Chimney and fireplace construction
US4947826A · kind A · utility
1Cited by
4References
15Claims
0Family size
Inventor
Key dates
| Filing date | Jan 12, 1990 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Jan 12, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24B1/189
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
Elongated, vertical air chambers having an open upper end and a closed lower end are located within or attached to the walls of a fireplace, where the upper ends open only into the interior of the fireplace. Air heated within the air chambers rises into the fireplace to increase the drafting efficiency, and is replaced in the air chambers by relatively cooler, draft inhibiting air drawn only from the upper interior of the fireplace. In large furnace applications, the air chambers are located in the lower portion of the chimney.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.