1. The structure and materials of the wall installed with the kitchen smoke exhaust hood should have sufficient strength. The external wall openings of smoke exhaust pipes and air ducts can be made of prefabricated concrete blocks with holes or embedded steel pipes. The installation method of thermal insulation wall (hollow brick is preferred) is the same as that of the normal wall. If the wall is not solid enough, wood or other materials should be used for reinforcement.

2、廚房排煙罩安裝的煙管直接穿過外墻室外，應該在室外排氣口設置防止污染環境和避風的構件。共用豎向煙道連接的吸油煙機，它的豎向煙道的斷面應根據所負擔的排氣量計算確定。

2. The smoke pipe installed on the kitchen smoke exhaust hood directly goes through the exterior wall to the outside, and the outdoor exhaust outlet should be equipped with components to prevent environmental pollution and avoid wind. For a range hood connected by a common vertical flue, the section of its vertical flue shall be calculated and determined according to the borne exhaust volume.

3、廚房排煙罩安裝頂吸式的安裝高度應該在燃氣爐灶上方少65 厘米的地方，在65-75 厘米之間是比較合適的。

3. The installation height of the top suction exhaust hood in the kitchen should be at least 65cm above the gas stove, which is more appropriate between 65-75cm.

廚房排煙罩安裝的煙管直接穿過外墻室外，應該在室外排氣口設置防止污染環境和避風的構件。共用豎向煙道連接的吸油煙機，它的豎向煙道的斷面應根據所負擔的排氣量計算確定。

The smoke pipe installed on the kitchen smoke exhaust hood directly goes through the exterior wall to the outside, and the outdoor exhaust outlet should be equipped with components to prevent environmental pollution and avoid wind. For a range hood connected by a common vertical flue, the section of its vertical flue shall be calculated and determined according to the borne exhaust volume.