FIELD: building industry. SUBSTANCE: void former has vertically arranged duct former, joined to a body of the seat former with possibility of disconnection. The duct former has two hollow recess former and horizontally arranged between them and joined with them another duct former, connected with the vertically arranged duct former with the aid of one of the hollow recess former and placed at zone of their axis crossing. EFFECT: simplified structure. 3 cl, 3 dwg
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