A channel for transporting air which can be connected to a supporting surface, comprising: a plurality of channelling modules sequentially connected along a main direction of extension of the channel; each channelling module extending along the main direction of extension between a first section of it for the flow of air and a second section of it for the flow of air opposite one another and alternatively shaped as a male joint and a female joint so that by creating a row of modules they are fitted inside one another wherein the male joint inside the female joint of the consecutive module; each module laterally having a closed side and an open side; said open side facing, in use, the supporting surface so that the air transport is achieved between the closed side and the supporting surface; connecting means operatively interposed between one channelling module and the other to connect them along the main direction of extension; supporting means operatively interposable between one channelling module and the supporting surface to connect the channelling module to the supporting surface; said supporting means being configurable between a fastened condition wherein the module is connected to the supporting surface and a released condition wherein the module is disconnected from the supporting surface; characterised in that the connecting means of at least one channelling module interposed between two respective channelling modules comprises an edge of the first passage section of the closed side and an edge of the second passage section of the closed side; said edges of the first passage section and of the second passage section being realised in a single piece with the channelling module so as to define a male edge or a female edge for defining said male joint or said female joint; at least one channelling module having both edges of the first section and of the second section of the female type the respective edges at least partly superposed with the respective edges of the male type of the closed sides of the adjacent channelling modules according a direction moving away from the supporting surface in such a way that by bringing the relative supporting means into the released condition, the channelling module is removed relative to the adjacent channelling modules according to a disassembly direction which is transversal to the main direction of extension in order to inspect the inside of the channel; the channel comprising suspension means connectable between a channelling module and the supporting surface for supporting the channelling module during the released condition. a plurality of channelling modules sequentially connected along a main direction of extension of the channel; each channelling module extending along the main direction of extension between a first section of it for the flow of air and a second section of it for the flow of air opposite one another and alternatively shaped as a male joint and a female joint so that by creating a row of modules they are fitted inside one another wherein the male joint inside the female joint of the consecutive module; each module laterally having a closed side and an open side; said open side facing, in use, the supporting surface so that the air transport is achieved between the closed side and the supporting surface; connecting means operatively interposed between one channelling module and the other to connect them along the main direction of extension; supporting means operatively interposable between one channelling module and the supporting surface to connect the channelling module to the supporting surface; said supporting means being configurable between a fastened condition wherein the module is connected to the supporting surface and a released condition wherein the module is disconnected from the supporting surface; characterised in that the connecting means of at least one channelling module interposed between two respective channelling modules comprises an edge of the first passage section of the closed side and an edge of the second passage section of the closed side; said edges of the first passage section and of the second passage section being realised in a single piece with the channelling module so as to define a male edge or a female edge for defining said male joint or said female joint; at least one channelling module having both edges of the first section and of the second section of the female type the respective edges at least partly superposed with the respective edges of the male type of the closed sides of the adjacent channelling modules according a direction moving away from the supporting surface in such a way that by bringing the relative supporting means into the released condition, the channelling module is removed relative to the adjacent channelling modules according to a disassembly direction which is transversal to the main direction of extension in order to inspect the inside of the channel; the channel comprising suspension means connectable between a channelling module and the supporting surface for supporting the channelling module during the released condition.