Do kitchen risers have to go out of the roof?

Adapted from the original works "Dong Sheng" and "Chu Sheng".

Want.

1. Refer to the "National Civil Construction Engineering Design Technical Measures 09 Edition": Article 1 stipulates that the height of the roof is "when the house has a setback or a roof, the exhaust duct and ventilation duct should be 2m higher than the roof, and avoid the doors and windows opened on the same floor, so as to avoid the smoke from returning into the room";

2. In addition, the "Measures" also make very specific provisions on the height of the exhaust pipe and ventilation duct of the sloped roof.

The pipe is less than a meter from the ridge and a meter from the ridge at a high point.

meters, higher than the ridge of the roof, and the height of the protruding roof is not less than meters.

More than meters, the angle between the top of the pipe and the ridge line and the horizontal line is not more than 10 degrees, and the height of the roof is not less than meters.

3. The exhaust duct is a chimney installed in the residential kitchen and bathroom to send the flue gas to the external space, and it is a non-metallic pipeline product used to eliminate the oil smoke generated by the cooking activities of the residential kitchen or the turbidity of the bathroom. It is also known as residential exhaust duct, residential ventilation duct, and residential flue duct. The exhaust duct is the main component of the common exhaust duct system of residential kitchens and bathrooms.

Fourth, in the past, most of the exhaust ducts of low-rise residential buildings were made of bricks, with the emergence of high-rise super high-rise buildings, the requirements for reducing weight, volume and simple installation gave birth to the exhaust ducts prefabricated by alkali-resistant glass fiber mesh sandwiched with sulfoaluminate cement or steel wire mesh and other reinforcing materials sandwiched with ordinary Portland cement. Since the national standard "Code for Residential Buildings", "Code for Fire Protection of Building Design" and other mandatory provisions stipulate that the fire resistance limit of exhaust ducts in residential buildings should not be lower than that, because it is difficult for cement prefabricated exhaust ducts to meet the fire resistance requirements, the exhaust ducts assembled by high-strength glass magnesium fireproof boards have been adopted.

5. When the flue gas from the air inlet is discharged into the flue, it will meet with the flue gas discharged from the lower layer to the top, and the two air flows will meet to form a vortex and an air curtain, which will hinder the upward movement of the flue gas in the lower layer. In order to overcome the above technical problems of smoke and odor, the current solution is to use the principle of aerodynamic dynamic and static pressure conversion, and set up a patented pressure transformer component developed by Jiangsu Ziwei Building Technology Research Institute to pull out and accelerate the air flow in the flue to complete the dynamic and static pressure conversion of the flue gas at a specific position, so that the exhaust port of the kitchen or bathroom without opening the smoke exhaust machine is in a negative pressure state, and use Bernoulli's theory (fluid energy balance equation) to form a pumping force, so as to eliminate the vortex and air blocking curtain. Solve the phenomenon of gas and odor in the exhaust flue.