Natural vent generally has good structural strength. Good design makes the continuous rooflight do not need to rely on large-size steel structures like shed skylights to achieve, which greatly reduces the weight of natural ventilator. The roof smoke vent is designed based on the structure of the building. In addition to considering the wind and snow loads and earthquake effects, most of the supporting structure of the factory building serves the roof load.

It can be seen that the selection of materials for natural vent is very important. It is not only necessary to fully guarantee to meet the requirements of wind and snow loads, but also to avoid the use of excessively large materials, increase the load of the ventilator itself, and increase the load of the factory building, and the cost is also increased, which is not worth the loss.

(1) Color steel plate is generally selected as the shielding and rain-shielding material of aluminum-zinc color steel plate, the thickness is 0.5mm, the strength is 280Pa, the amount of aluminum-zinc plating on both sides is ≥150g, the thickness of the coating film is 22-25um on the front and 15mu on the back. The board is characterized by good corrosion resistance.

(2) Daylighting board. Choose the daylighting board with good corrosion resistance, FRP daylighting board.

Mcwell's FRP daylighting board uses high-quality unsaturated polyester produced by Ashland Company in the United States, which has good stability and durability. The daylighting board has better anti-yellowing and anti-aging properties, and the product has a long service life. The steel structure roof is usually 1.5mm for daylighting, the side wall is usually 1.2mm for daylighting, and the ventilator rain-proof board is 1.2mm or 1.5mm thick.