FIELD: machine building.
SUBSTANCE: spiral header comprises casing for radial fan impeller and includes the first and the second semi-covers which can be attached to each other along connection line. One of the above semi-covers includes a nozzle which determines outlet cross section of header, and detachable connecting means provided between semi-covers. Connecting means include the first adjacent connecting means between the corresponding semi-covers which are provided on nozzle; the other shaped adjacent connecting means between the corresponding semi-covers, which are provided at least in section of connection line; latching connecting means and counter-means between semi-covers, which are provided on opposite side relative to nozzle.
EFFECT: reliable, quick and easy connection of semi-covers of header.
20 cl, 15 dwg
