The kitchen gas studio has an exhaust hood, so the ventilation capacity of the exhaust hood is relatively large. When using gas, the exhaust hood is exhausting smoke, so there is no need to consider the ventilation of the furnace room. Only pay attention to the kitchen exhaust pipe to be sealed, to prevent poisoning during non working hours. The horizontal end of the kitchen smoke exhaust pipe should not be too long. Generally, the horizontal distance is more than 15m, and the slope is greater than 2%. The horizontal end should be installed with a movable joint to facilitate oil cleaning. Jinan smoke hood reminds everyone that the exhaust speed is less than 10 meters per second, and the wind speed is too low. It is necessary to prevent the oil from adhering to the smoke pole. The branch connecting the exhaust port should be installed with air volume regulating valve.

由于自然風受到自然條件的限制，具有多變性，消防排煙管道安裝為不可控因素。但是實際情況肯定是熱壓通風以及風壓通風同時作用，實際情況也就優于只討論熱壓通風的情況。

Due to the limitation of natural conditions, natural wind has variability, and the installation of fire smoke exhaust pipe is an uncontrollable factor. But the actual situation is certainly that the hot pressure ventilation and the wind pressure ventilation work at the same time, and the actual situation is better than that of only discussing the hot pressure ventilation.

濟南排煙管道要保證自然通風的順暢、充分，條件是有足夠大面積的進風口、出風口，并且合理布置進、出風口以及合理設計進、排氣口面積。

Jinan smoke exhaust pipe to ensure smooth and sufficient natural ventilation, the condition is to have enough large area of air inlet and outlet, and reasonable layout of air inlet and outlet, and reasonable design of air inlet and outlet area.

換氣次數就是讓廠房內的氣流達到一定的流速，在只討論熱壓通風的情況下，因為是流水線定型生產，所以廠房內生產活動產生的余熱在一定周期內可以認為是不變的，產生的余熱在小范圍內氣體溫度變化一致。

The air change frequency is to make the air flow in the workshop reach a certain flow rate. Under the condition of only discussing the hot pressure ventilation, the waste heat generated by the production activities in the workshop can be considered as unchanged in a certain period, and the temperature change of the gas body is consistent within a small range.

濟南排煙罩

Jinan exhaust hood

在考慮產生的余熱不變、空氣的各物理特性不變、進出口面積合理的情況下，就會得到外界溫度越低，廠房內的氣流流速就會越高，就是同等條件下，外界溫度降低，廠房內換氣次數就會相應增多。

Under the condition that the waste heat generated remains unchanged, the physical characteristics of the air remain unchanged, and the area of the inlet and outlet is reasonable, it can be concluded that the lower the external temperature is, the higher the air flow velocity in the workshop will be, that is, under the same conditions, the lower the external temperature, the more air changes in the plant will be.