AIR CONDUIT MAKING METHOD Russian patent published in 2000 - IPC

FIELD: ventilation systems of dwelling houses and industrial buildings; ventilation and air conditioning systems. SUBSTANCE: method of air conduit making consists in making of sheathing and hollow skeleton and connecting sheathing to skeleton. Novelty is that separate perforated tubes are taken and laid onto horizontal surface with subsequent making of plate from these tubes by hinge-coupling the tubes to each other by fasteners and attachments. Skeleton is made by fitting the plate onto attachments and subsequent connection of plate ends to each other. EFFECT: reduced usage of materials. 3 cl, 3 dwg