Abstract: At the user end of high-rise residential buildings, the range hood is usually connected to the public flue check valve through the exhaust pipe and then to the public flue. Therefore, a pipe network is formed at its rear end and exhaust resistance is created. At the user end, the quality of the smoke extraction effect is not only related to the performance of the range hood. but also closely related to the back-end pipe network resistance. Aiming at the problem of exhaust resistance at the rear end of range hood in high-rise residential buildings, the experimental platform of the public flue in high-rise residential buildings was set up, and the exhaust resistance at the rear end of the smoke hood was studied by qualitative to quantitative method. The results show that the type of check valve has a great influence on the pipe resistance of the rear end of the range hood, and the resistance variation rule is different in different application scenarios. The resistance of the single disc check valve is relatively large, and the resistance of the high and low layers is basically no difference. Under extremely harsh working conditions, the effective air volume of the high-grade smoker is only 8.43 m³/min, which is difficult to achieve a good smoking effect. Finned check valve resistance is smaller, its one-way infusion effect, can effectively narrow the exhaust resistance between the high and low layers, in extremely harsh conditions, the lowest layer of high-grade effective air volume of more than 12 m³/min, the highest up to more than 13 m³/min, and are reverse higher than the ideal state of the non-valve piece, the effective air volume increased by 7.9%, 8.87%, respectively. Therefore, finned check valves are more suitable for high-rise residential applications. This study provides a reference for the selection and optimization of public flue non-return valve types for high-rise residential buildings.

Key words: Range hood, Public flue, Check valve, Exhaust resistance, Effective air volume