英语
西班牙语
阿拉伯语
26
Aug
The access panel can be made of roof ventilation holes by two methods，concealed method and direct method:
1. Concealment method: Use normal construction methods to waterproof the interface, and design the part that goes into the house into the ventilation pipe.
2. Direct method: the ventilation holes are made directly from the roof, normal construction, and waterproofing. The difference between the two methods is that they are the same after going out of the roof. The difference is that one is in the light and the other is in the dark.
