Gas removal apparatus
US5438324A · kind A · utility
Inventors
Key dates
| Filing date | Oct 12, 1993 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Oct 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S454/909
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An apparatus for exhausting contaminant-laden air from a building area includes a monitoring device for determining when a contaminant level has exceeded a preselected value and which provides an output signal when the contaminant level has exceeded said preselected value, a motor-driven exhaust fan and associated conduit means for expelling air from the building area, and a timer-control circuit for actuating the exhaust fan for a predetermined period of time in response to an output signal from the monitor that the concentration of the contaminant has exceeded the preselected level. The apparatus allows for the removal of contaminants from an occupancy area of a building only when the level of the contaminant exceeds a preselected level, and only for a maximum predetermined period of time effective to reduce the amount of contaminant in the air to a safe level, thereby providing effective, energy efficient means for maintaining contaminant concentrations below a desired level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.