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Outline
To address the issue of insufficient ventilation in kitchen exhaust systems operating under high‑resistance conditions，this study proposes reducing resistance by placing a duct fan downstream of the range hood.A test platform was constructed to simulate a kitchen environment with high exhaust resistance，and the feasibility of using duct fans in series to assist exhaust in systems equipped with several types of range hoods was investigated.On this basis，the study analyzed the impact of adding a duct fan on the system's air volume and noise when the exhaust air volume fails to meet the empirical requirement of 11 m³/min due to excessively high pipeline network resistance.Experimental results showed that when the selected duct fan operates at a constant speed of 2 800 r/min，the operating air volume of all 4 selected range hood models increases by approximately 2 m³/min，meeting the 11 m³/min exhaust air volume requirement.Increasing the range hood's rotation speed to achieve a 2 m³/min increase in air volume will result in a noise increment of 5 dB~6 dB，while the series‑connected duct fan scheme has a 3 dB~7 dB advantage in comparison.Moreover，the higher the pipeline network resistance，the greater the noise difference.This research can provide a theoretical reference for the engineering application of series‑connected duct fans in assisting exhaust，and its experimental method is applicable to the study on the practical value of various systematic exhaust schemes.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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