Flue restrictor
US4263890A · kind A · utility
14Cited by
11References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1978 |
| Grant date | Apr 28, 1981 |
| Priority date | — |
| Expiry date | Sep 1, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23L13/06
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A flue restrictor for installation in the flue piping of a heating system to reduce its effective cross sectional area comprises sheet metal inlet and outlet sections having flanges secured together in a joint that has a guideway in it for a sheet metal gate valve that may be transversely positioned to produce the desired cross-sectional area and riveted in place to provide a substantially tamper-proof assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.