The ridge ventilator is based on the principle of fluid mechanics, whether it is to discharge indoor high temperature or air polluted by harmful substances, or to transport outdoor air to the room, its essence is to promote indoor air flow. Second, steel roof ridge vent will overcome doors and windows resistances. Therefore, creating a certain amount of power to the air is a necessary condition for ventilation, and natural ventilation is a method and principle that uses the thermal pressure or wind pressure generated by the temperature difference between indoor and outdoor to achieve air exchange.

(1) Natural ventilation caused by heat pressure

When the temperature difference between the inside and outside of the workshop is different, and the indoor air temperature is higher than the outdoor air temperature, the light weight of the hot air has a force to run upwards, so the outdoor air is replenished into the room from the doors, windows, and vents below.

(2) Natural ventilation caused by wind pressure

The power of natural wind can also be used to ventilate the room. There are doors and windows on the building, and the wind can blow from the doors and windows on the windward side, blowing indoor hot air from the leeward side and the air floor to achieve indoor ventilation.

(3) Natural ventilation caused by the combined action of heat pressure and wind pressure

Under the combined action of the above two conditions, the heat pressure and wind pressure can achieve the purpose of indoor natural smoke exhaust and ventilation. Ridge ventilator in actual buildings is a structure that combines wind pressure and heat pressure. When wind pressure and heat pressure work together, it is not a simple linear superposition. Therefore, various factors should be fully considered in the design of the plant, so that the wind pressure and heat pressure can complement each other and be used in close coordination.