FIELD: mechanics, heating.
SUBSTANCE: one-piece spiral air duct incorporates a curvilinear box and rectilinear connecting boxes arranged on both ends of the aforesaid curvilinear box. Note here that the curvilinear box is made integral with the connecting rectilinear boxes in a spiral manner so as to avoid joints.
EFFECT: ease of manufacture, higher quality and efficiency, longer life.
6 cl, 9 dwg
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