# US 5,702,296 A · Portable ventilation system

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- Number: US 5,702,296 A
- Document ID: US5702296A
- Status: Granted
- Kind: A
- Application number: 08/739,195
- Filed: 1996-10-30
- Granted: 1997-12-30
- Earliest claimed: 1995-10-31
- Assignees: Grano Maleri & Dekor AB
- Inventors: Lars Grano
- Web page: https://patentgrep.com/patent/US5702296A

## CPC

- F24F 7/013: using wall or window fans, displacing air through the wall or window
- F24F 2011/0002: {for admittance of outside air}
- F24F 2221/12: transportable
- 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

A portable ventilation system includes a portable unit (1) comprising a fan (11) for sucking-in fresh air from the outdoor atmosphere and blowing the fresh air into a room, and an extraction fan (12) for sucking foul air from said room and blowing the foul air into the outdoor atmosphere. The system includes a flexible air conduit (13) having two mutually separate passageways (131, 132) which are arranged so as to obtain a transfer of heat between the passageways, through the medium of a wall of one passageway (132). One end of one passageway (131) is connectable to the input side of the fresh-air suction fan (11) and one end of the remaining passageway (132) is connectable to the output side of the foul-air extraction fan (12). Remaining ends of the passageways are intended to be placed in connection with the outdoor atmosphere. The two passageways (131, 132) of the flexible conduit (13) may be divided into a number of concentrical sub-passageways which are disposed so that each alternate sub-passageway is associated with one passageway (131) and each other alternate sub-passageway is associated with the remaining passageway (132). A distributed, counter-flow heat-exchanging effect is obtained in this way.

## Claims

### Claim 1

A portable ventilation system, which comprises a suction fan (11) for sucking-in fresh air from the outdoor atmosphere and blowing said fresh air into a room, an extraction fan (12) for extracting foul air from said room and causing the foul air to be blown into the outdoor atmosphere; and a flexible air conduit (13) intended to be mounted in a gap defined by a partially opened window and which has two mutually separate passageways (131, 132) arranged for the transfer of heat between said passageways through the medium of a wall of one passageway (132), wherein one end of one passageway (131) being connectable to the input side of the fan (11) through which fresh air is sucked-in and the other end of the passageway (132) is connectable to the output side of the foul-air extraction fan (12), and wherein the remaining ends of the passageways (131, 132) are disposed for the free flow of air therethrough from/to the outdoor atmosphere outside the only partially open window.

### Claim 2 (depends on 1)

A ventilation system according to claim 1, wherein the air conduit (13) has a compressible part which is intended to be placed in the gap defined by the partially opened window.

### Claim 3 (depends on 1)

A ventilation system according to claim 1, further including a nozzle means (14) which is intended to be placed in the gap defined by the partially open window and which coacts with said remaining ends of the passageways (131, 132), wherein one side of said nozzle means includes openings for said remaining ends and the opposite side includes openings for connection of inflatable gap-filling hoses (16) through which extracted foul air passes and which are positioned in the window opening with their free ends located in the outdoor atmosphere.

### Claim 4 (depends on 3)

A ventilation system according to claim 3, wherein the openings on said opposite side of the nozzle means (14) are three in number and comprise a central intermediate and relatively large opening in the middle intended for air that is sucked-in, and an upper and a lower relatively small opening on each side of the central opening for receiving extracted air.

### Claim 5 (depends on 1)

A ventilation system according to claim 1, wherein in that the connection to the fan (11) which sucks-in fresh air includes a heating element (18) for heating said fresh air.