Fume hood with step baffles
US4785722A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Jul 28, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB08B15/023
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A fume hood having a step baffle system that improves uniformity of flow under different operating conditions, increases draw along the work surface, and, in general, enhances hood performance. An intermediate baffle plate of the baffle system may be pivotally mounted and may be associated with a remote-control mechanism for adjusting its operating position. A rectangular bellmouth collar at the exhaust opening of the hood contributes in achieving a high level of hood efficiency and permits nearly vertical orientation of the fixed uppermost baffle plate, thereby providing greater work space within the upper portion of the hood chamber. Exhaust ports at the top corners of the upper baffle plate promote and control the vertical flow of gases in the upper portion of the hood chamber to aid in the evacuation of fumes from that region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.