# US 5,704,833 A · Clean room

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- Number: US 5,704,833 A
- Document ID: US5704833A
- Status: Granted
- Kind: A
- Application number: 08/791,328
- Filed: 1997-01-31
- Granted: 1998-01-06
- Earliest claimed: 1996-01-31
- Assignees: Aerospatiale Societe Nationale Industrielle
- Inventors: Jean-Michel Reix; Georges Cina; Jean-Pierre Philipoussi
- Web page: https://patentgrep.com/patent/US5704833A

## CPC

- F24F 3/167: Clean rooms, i.e. enclosed spaces in which a uniform flow of filtered air is distributed (air distribution by perforated walls F24F7/10)
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)

## Abstract

The present invention concerns a clean room featuring a closed enclosure having at least two opposite walls, a first of said walls being provided with blower means adapted to blow into said room a gaseous fluid, in particular air, having a specified controlled particle concentration, and a second wall being provided with evacuation means adapted to evacuate the gaseous fluid blown into said room. In accordance with the invention, said first wall is divided into at least two blower sectors, the blower means of each of said blower sectors blowing a gaseous fluid that has a uniform particle concentration different from the particle concentration of the other blower sector.

## Claims

### Claim 1

A clean room featuring a closed enclosure having at least two opposite walls, a first of said walls being provided with blower means adapted to blow into said room a gaseous fluid, in particular air, having a specified controlled particle concentration, and a second wall being provided with evacuation means adapted to evacuate the gaseous fluid blown into said room, wherein:
said first wall is divided into at least two blower sectors, the blower means of each of said blower sectors blowing a gaseous fluid that has a uniform particle concentration different from the particle concentration of the other blower sector; and
said second wall is divided into evacuation sectors that are opposite respective blower sectors of said first wall and each of which evacuates the gaseous fluid from said opposite blower sector.

### Claim 2 (depends on 1)

The clean room claimed in claim 1 wherein said opposite walls are two opposite walls of said clean room.

### Claim 3 (depends on 1)

The clean room claimed in claim 1 wherein said first wall is the ceiling and said second wall is the floor of said clean room.

### Claim 4 (depends on 1)

The clean room claimed in claim 1 wherein said gaseous fluid evacuated by each of said evacuation sectors is recycled to the non-opposite blower sector.

### Claim 5 (depends on 4)

The clean room claimed in claim 4 wherein said gaseous fluid to be evacuated is channeled in said second wall and is directed towards said first wall by means of networks of feed connections.

### Claim 6 (depends on 1)

A clean room as claimed in claim 1 further including activated carbon filters disposed where said gaseous fluid enters said blower means.

### Claim 7 (depends on 1)

A clean room as claimed in claim 1 having at least two different particle concentration areas and including a removable opaque curtain adapted to be deployed along the line of separation between said areas so as to prevent the passage of light from one area to the other.

### Claim 8 (depends on 1)

The clean room claimed in claim 1 wherein the walls of said clean room are plane and uniform in order to reduce the possibility of retention of particles and are coated with a material that is easy to clean.