Installation standard of electric smoke vent skylights: The natural smoke exhaust vent should be set on the top of the smoke exhaust area or on the outer wall. When the natural smoke exhaust vent is installed on an external wall, the elevation of the bottom of the natural smoke outlet should not be less than 1/2 of the indoor clear height, and there should be a convenient opening device. For this provision, Mcwell believes that the height of natural smoke exhaust during a fire should not be lower than the breathing area of the human body, otherwise it will affect the evacuation speed of people and delay the escape time.

Generally speaking, most of the shopping malls, theaters and other public buildings that need to set up smoke vent skylights to exhaust smoke (residential buildings generally have large open windows), and the space under the ceiling is generally 3.5 meters Above, 1/2 of the net height will not be less than 1.7 meters.

The smoke vent is set above this height to be higher than the breathing area of the human body, which is conducive to escape in the event of a fire.

The smoke exhaust area of the automatic opening vents installed on the external wall shall be determined according to the following requirements:

a. When the window opening angle is greater than 70 degrees, the smoke exhaust area FP can be calculated according to the window area FC;

b. When the window opening angle is less than 70 degrees, the smoke exhaust area is approximately calculated as FP=FC.sina.