PREVENTING DEVICE FOR STACK RAIN

PURPOSE:To prevent stack rain phenomenon by providing a plurality of guide vanes inclined at approximately equal angle to the same rotating direction around an axis in a flue, thereby effectively collecting condensed water in exhaust gas in the flue. CONSTITUTION:A plurality of stationary guide vanes 7, 8 radially divided approximately at the center of the axis 5 of a vertical flue 2 of a chimney 1 are fixedly arranged via a supporting rod 4 at the suitable height in the flue 2 in the state approximately perpendicularly crossing the axis 5. The vanes 7, 8 are inclined approximately at the same angle to the same rotating direction, and the lower edges of the vanes are bent upward as troughs 9. The troughs 9 are inclined downward from the axis 5 toward the inner wall surface of the flue 2, and one end 9a is brought near to the inner wall surface of the flue 2. In this manner, when exhaust gas rising in the flue 2 collides with the lower surfaces of the vanes 7, 8, condensed water in the exhaust gas is collected and is flowed from the troughs 9 along the inner wall surface of the flue 2.