The protruding height of the flat roof shall not be less than 0.6m, and shall not be lower than the height of the parapet. The protruding height of the sloped roof shall comply with the following regulations:?
1. Flue and ventilation When the center line of the road is less than 1.5m from the roof ridge, it should be 0.6m higher than the roof ridge.
2. When the center line of the flue and ventilation duct is 1.5-3m away from the roof ridge, it should be higher than the roof ridge, and the height beyond the roof should not be less than 0.6m.
3. When the center line of the flue and ventilation duct is more than 3m above the roof ridge, the angle between the line connecting the top of the flue and the roof ridge and the horizontal line should not be greater than 10°, and the height beyond the roof should not be less than 0.6 m.
The flue and ventilation duct should protrude from the roof. The protrusion height should be conducive to the diffusion of smoke, and should be determined according to the roof form, the height and distance of the obstructions around the exhaust outlet, and the depth of snow.
Extended information:
For spaces with direct natural ventilation, the ventilation opening area should meet the following requirements:?
1 Ventilation openings in living and working rooms The effective area should not be less than 1/20 of the floor area of ??the room;?
2 The effective area of ??the ventilation openings in the kitchen should not be less than 1/10 of the floor area of ??the room, and should not be less than 0.60m2. The kitchen stove Oil fume removal equipment should be installed above and a flue exhaust duct should be provided.
3. For residential buildings in severe cold areas, kitchens and bathrooms should be equipped with natural ventilation channels or ventilation facilities.
4. Bathrooms and toilets without external windows should be equipped with mechanical ventilation facilities and ventilation ducts. ?
5. Fixed air inlet louvers should be installed under the doors of the kitchen and bathroom, or there should be air inlet gaps.
6. The natural ventilation duct should be located on the opposite side of the window or air inlet. ?
Reference: Baidu Encyclopedia-General Principles of Civil Building Design