Wall thimble with outside air inlet
US8230849B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2009 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Jan 27, 2031 |
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 as part of a venting apparatus for a 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 combustion air for use by the heating appliance. The wall thimble is preferably formed as a two-cylindrical part housing such that a first portion can be inserted into a second portion. When a smaller exhaust pipe is routed through the two-part housing, an annular region is formed between the exhaust pipe and the walls of the housing. A first air vent is formed in the first portion to draw combustion air into the annular region from outside. A second air vent is formed in the second portion to route the combustion air from the annular region out through the second air vent to be coupled with the combustion air inlet. A baffle is disposed in the first portion to preheat the combustion air. A duct assembly with an adjustable extension may be coupled to the second air vent to provide a below-grade installation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.