1. Thin ventilators are divided into double-sided ventilation units in the national standard atlas Ventilation Skylight 05J62 1-3, and single-sided ventilation units in the atlas Truss Thin Skylight of Jinzhou Xiang Peng Company 1 1J33, including Yangzhou Air Conditioning, Nantong Shenghao and Nantong Jinghai. From 20 10, McVeigh formed the national standard atlas based on the patented parallel air duct technology, and from 20 13, jinzhou area Xiang Peng Company developed the thin ventilator technology with quadruple rain-proof structure based on the patented truss technology to expand the ventilation unit.

2. The ventilation performance of the ventilator is determined by the effective ventilation area of the ventilator. The rainproof plate and drainage trough of thin ventilator are in the ventilation opening area, which affects the effective ventilation area. Therefore, it is difficult for a thin ventilator to reach half of the vents, that is, 50%.

3. Actually, the effective ventilation area is not only related to the actual vent size, but also related to whether the ventilation is smooth and ventilation resistance. Smooth ventilation and large ventilation space will inevitably lead to small ventilation resistance, large ventilation flow coefficient and good ventilation performance.

4. Ventilator is a structural technology, and there is nothing complicated in terms of ventilation. Simply look at the ventilation performance of the effective vent inside the ventilator (not the roof vent). At present, the "effective vent size" of thin ventilators in China can reach about 40-45, so it is difficult to prevent rain, or measures should be taken to increase ventilation space and increase the cost of rain prevention. The vent of many thin ventilators is about 30%. Therefore, the ventilation performance of various thin ventilators can be based on these figures, and other knowledge without technical foundation is enterprise publicity materials, which is not credible.