Wall thimble with outside air inlet
US7665457B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2007 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Jul 23, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24C15/002
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An improved wall thimble is useful as part of a venting apparatus for a direct vent heating appliance. Dual functionality is provided in a single wall thimble device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in outside combustion air for use by the heating appliance. The wall thimble is formed as a two-part housing such that a first cylindrical portion can be inserted into a second cylindrical portion. When a smaller diameter exhaust pipe is routed through the cylindrical portions, an annular region is formed between the exhaust pipe and the cylindrical portions. A first air vent is formed in the first cylindrical portion to draw combustion air into the annular region from outside. A second air vent is formed in the second cylindrical portion to route the combustion air from the annular region to an opening in the housing where a combustion air inlet pipe is connected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.