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US 4,905,578 AGranted
Apparatus for ventilating controlled areas
OwnerMichael S. Curtis, Robert W. Weeks, Jr.inventors
Life of this patent
Estimating the term…
Abstract
The apparatus includes a device adapted for removing contaminated air from a controlled area, cleansing this air using suitable filtration devices, and returning air having a safe level of contaminants mixed with a portion of fresh air or solely fresh air to the controlled area. The apparatus further includes barrier means for preventing contaminants from exiting the controlled area except through the air removal device which can be located either inside or outside of the controlled area.
Claims22
A controlled area ventilation apparatus comprising in combination:
- a substantially airtight enclosure having at least one first entrance port for permitting air to pass from inside of the controlled area into said enclosure, at least one second entrance port for permitting air from outside of the controlled area to pass into said enclosure, and at least one first exit port for permitting air to pass from inside of said enclosure into the controlled area;
- air circulating means inside of said enclosure having the output thereof directed towards said at least one first exit port;
- first air flow control means covering said at least one first entrance port for controlling the flow of air therethrough;
- second air flow control means covering said at least one second entrance port for controlling the flow of air therethrough;
- and
- third air flow control means covering said at least one first exit port for controlling the flow of air therethrough, whereby a chosen differential pressure can be established inside of the controlled area.
3 more elements
A controlled area ventilation apparatus comprising in combination:
- a substantially airtight enclosure having, at least one first entrance port for permitting air to pass from inside of the controlled area into said enclosure, at least one second entrance port for permitting air from outside of the controlled area to pass into said enclosure, at least one first exit port for permitting air to pass from inside of said enclosure to a location outside of he controlled area, and at least one second exit port for permitting air to pass from inside of said enclosure into the controlled area;
- first air circulating means inside of said enclosure having the output thereof directed towards said at least one first exit port;
- second air circulating means inside of said enclosure having the output thereof directed towards said at least one second exit port;
- first air flow control means covering said at least one first entrance port for controlling the flow of air therethrough;
- second air flow control means covering said at least one second entrance port for controlling the flow of air therethrough;
- third air flow control means covering said at least one first exit port for controlling the flow of air therethrough;
- and
- fourth air flow control means covering said at least one second exit port for controlling the flow of air therethrough, whereby a chosen differential pressure can be established inside of the controlled area.
5 more elements
Dependencies are inferred from the claim text.