Up-and-down hood

An up-and-down extraction hood adapted to extract at least one of fumes or vapours generated from a hob, said hood comprising:

• a first hood portion (2) adapted to be attached to a ceiling (3) of an environment in which the hob is placed;
• a second hood portion (4) spaced apart from the first hood portion (2) and adapted to be closer to the hob,
• connection and support elements (5) that connect the first hood portion (2) to the second hood portion (4),
• an extraction device (6) in said second hood portion, the extraction device (6) adapted to extract air containing the at least one of fumes or vapours from the hob when the hood (1) is in use, said air being drawn in towards an opening (11) in said second hood portion (4) to be discharged therefrom and passed towards the first hood portion (2),
• the first hood portion (2) comprising a separate extraction device that draws in the air leaving the second hood portion (4) and extracted from the hob,
• a conveyor (10) provided at the opening (11) in the second hood portion (4) that is adapted to convey the discharged air towards the first hood portion, the conveyor (10) including a body (30) having a tubular annular shell (31) containing a honeycomb structure (32) with a plurality of tubular cells (42) through which the air leaving the second hood portion (4) is discharged.