| http://www.w3.org/ns/prov#value | - The side wall perpendicular to diaphragm 10 of said sections, are spiral shaped, as clearly shown in FIG. 3, to serve as delivery conveyors for the fan wheels (as described later on), having said conveyors their outlets in upper spaces 16 and 18 respectively, which as clearly shown in FIG. 2, are shaped in such a manner as to deflect through 90 to the outside, the air blasts delivered by the wheel
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