Ventilation group for flow reversal

1. A ventilation group for flow reversal, comprising a fan associated with a housing inside which there are defined:

a first chamber receiving flow blown by the fan;

a second chamber from which the flow is drawn into the fan:

a first pair of paths for the ventilation flow, associated with said first chamber;

a second pair of paths for the ventilation flow, associated with said second chamber;

a third chamber associated with

a first path in said first pair of paths, and

a first path in said second pair of paths;

a fourth chamber associated with

a second path in said first pair of paths, and

a second path in said second pair of paths;

wherein said paths are intercepted by corresponding valves that may take, in pairs, a closed or an open configuration such that only one path at a time in each pair of paths is activated, whereas the other two paths are deactivated; and

wherein said third chamber is divided into two sub-chambers, a first sub-chamber associated with said first path in said first pair of paths and a second sub-chamber associated with said first path in said second pair of paths.

2. The ventilation group as claimed in claim 1 , wherein said housing includes:

a baffle externally defining said first chamber and internally defining said second chamber;

a first opening and a second opening for connecting said fan with said housing, said first opening and said second opening being associated with said first chamber and said second chamber, respectively;

a first external hole associated with one path in said second pair of paths and/or a second external hole associated with one path in said first pair of paths and one path in said second pair of paths, and a third external hole associated with one path in said first pair of paths;

first internal holes and second internal holes facing said first internal holes, each of said first and second internal holes being associated with a corresponding one of said paths.

3. The ventilation group as claimed in claim 2 , wherein said valves are mounted in seats formed by said first internal holes and said second internal holes.

4. The ventilation group as claimed in claim 1 , wherein said valves are controlled by a single actuator and are throttle valves arranged in line and oriented at 90° relative to each other.

5. The ventilation group as claimed in claim 2 , wherein said housing includes a first section with a half-cylinder shape, a second section shaped as a parallelepiped with rectangular cross section, and a third section shaped as a parallelepiped with square cross section, said sections being connected to one another.

6. The ventilation group as claimed in claim 5 , wherein said second section is connected, at one end, to said first section so as to form an L-shaped structure, and is connected, at the end opposite with respect to said first section, to said third section, which therefore forms an extension thereof, said L-shaped structure favouring the positioning of a fan equipped with an intake duct and a delivery duct arranged at 90° relative to each other.

7. The ventilation group as claimed in claim 6 , wherein said first section is substantially empty and includes said first opening for the connection of the delivery duct of the fan.

8. The ventilation group as claimed in claim 6 , wherein said second section includes said second opening for connection of the intake duct of the fan, said four first internal holes and said baffle, said baffle being so located that it internally encloses the central holes among said four first internal holes as well as said second opening.

9. The ventilation group as claimed in claim 6 , wherein said third section includes said four second internal holes corresponding to and facing said four first internal holes, and said first external hole and/or second external hole and third external hole, said first and/or second external holes being located on the face opposite that having said four second internal holes, said third external hole being located on the face opposite the face by which said third section rests on the ground, and wherein a first partition and/or a second partition are provided upstream and downstream said first external hole.

10. The ventilation group as claimed in claim 9 , wherein said third section further includes a closing plate that can be placed on said first external hole.

11. The ventilation group as claimed in claim 9 , wherein said first partition is movable.

12. A plant for the treatment of organic wastes, characterised in that it includes a ventilation group as claimed in claim 1 .

13. The plant as claimed in claim 12 , wherein the ventilation group is configured so as to draw air from the environment outside said plant.

14. The plant as claimed in claim 12 , wherein the ventilation group is configured so as to draw used-up air from the environment inside said plant.