1.5-3.0m, higher than the roof, and the height of the roof is not less than 0.6m;
When it is more than 3.0m, the included angle between the top of the pipeline and the roof line and horizontal line shall not be greater than 10 degree, and the height of the roof shall not be less than 0.6m..
Article 1 1.2.9 of the National Technical Measures for Civil Building Engineering Design cited in the above-mentioned materials stipulates the height of the roof: "When the house has a roof, the smoke exhaust duct and ventilation duct should be 2m higher than the roof, and avoid the doors and windows opened on the same floor to prevent the smoke from escaping indoors".
Extended data:
principle
When the flue gas from the air inlet is discharged into the flue, it will meet the flue gas discharged upward from the lower floor. When the two air streams meet, a vortex and an air curtain will be formed, which will hinder the upward movement of the lower flue gas. Once the fire check valve is stuck by oil pollution and can't be opened, the smoke will flee indoors because of its upward movement. ?
In order to overcome the technical problems of flue gas and odor, the solution is to use the principle of dynamic and static pressure conversion of aerodynamics to set a patented variable pressure component for extracting air and accelerating air flow in the flue, which was developed by Jiangsu Zitai Institute of Architecture and Technology to convert the flue gas from dynamic pressure to static pressure at a specific position.
The exhaust port of the kitchen or bathroom where the range hood is not turned on is in a negative pressure state. The Bernoulli theory (fluid energy balance equation) is used to form suction force, so as to eliminate eddy current and air barrier and solve the crosstalk and odor phenomenon in the smoke exhaust pipeline.