Fume hood controller
US4706553A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | May 8, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB08B15/023
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A fume hood controller system in which the sash position is monitored by a transducer which provides a signal indicative of the area of the hood opening. A variable speed motor controller is responsive to the sash position signal to provide a fan speed which varies in a substantially continuous and linear manner as a function of the sash opening. In an alternate embodiment, the air flow through the hood is controlled by a damper or similar device. Several embodiments are shown in which the present invention may be used to control a fume hood system in which a blower exhausts a plurality of fume hoods while maintaining a substantially constant face velocity in each hood.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.