1. The patent of parallel duct ventilator states that its "effective ventilation area is more than 80%, while other ventilator is less than 40%", that is, its ventilation performance is nearly twice as high as that of other similar products, but this violates the structural design and functional conditions that ventilator should be ventilated and rainproof. Under the same structural conditions, it is impossible to have good ventilation, good rain protection, large effective ventilation area and good rain protection. In the later stage, the inclination of the flashing board was reduced, the flashing area was increased, the middle partition board was added, and the parallel air duct was changed into a partition air duct to prevent rainwater from splashing laterally in the air duct.
2. The problem that the ventilation fan with parallel air duct "the rainwater flow speed is too fast" causes the water in the drainage tank to be too large, and the drainage is not as good as leakage. It is the reason why the parallel air duct ventilator adopts inclined flooding different from other conventional technologies, and the inclination is too large, which leads to the drainage of all layers being diverted to the bottom. In the later stage, corrugated cardboard is used for flooding, which forms lateral drainage and reduces downward displacement.
The above is the related patent information of parallel duct ventilator.