Method and apparatus for controlling a fume hood
US5240455A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1991 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Aug 23, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB08B15/023
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to a fume hood controlling method and apparatus which reduces the amount of replacement air required to operate a fume hood by permitting the fume hood to operate at a relatively low face velocity in the absence of a containment affecting condition, but which is capable of detecting the occurrence of a containment affecting condition, such as the presence or movement of a user within a selected area of the face of the fume hood, and of increasing face velocity to a selected level in response to such detection. When the detected condition no longer exists, the control automatically returns the fume hood to the lower face velocity, preferably with a time delay. Maximum replacement air volume and minimum replacement air volume may also be controlled in response to such detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.