1. Spacing of air vents: According to the requirements of specifications, air vents should be located on the elevator shaft wall between each floor, and the spacing should not be greater than 18m.
2. Size of vent: the height of vent should not be less than 300mm, and the width should not be less than 150mm.
3. Set ventilation openings to keep the elevator shaft ventilated, so as to exhaust smoke, gas and hot air in case of fire, and improve the efficiency of personnel escape and rescue. According to different regions and specifications, the specific design and installation requirements may be different. It is suggested to operate according to local laws and regulations, and consult relevant local departments or professionals to obtain accurate information.