Generally, how much larger is the reserved hole in the air duct of the kitchen and bathroom than the

The reserved hole hanging formwork has just been introduced to the market, that is, with its convenience and practicality and the practical economic benefits brought to the construction and installation contractors, it has quickly been welcomed and affirmed by the construction, building materials market and the majority of construction contractors! In recent years, China's urban and rural infrastructure and real estate development have shown a straight upward trend. In order to reduce production costs, improve work efficiency, improve construction quality and construction progress, and enhance their market competitiveness, many construction and installation enterprises are eager to seek new construction technology and supporting products to replace the old and rough construction methods, so as to save labor and material expenses, improve construction quality, and speed up the construction progress.

According to the statistics of the construction department, the number of projects under construction in China's provincial capitals has remained above 5,000 all year round, the number of projects under construction in prefecture-level cities has been around 2,500 all year round, and the number of projects under construction in county and city-level cities has been around 1,000. Taking a 15-storey 4-unit building as an example, there are 10 reserved openings per household (one kitchen and one bathroom), and about 1,200 reserved openings need to be plugged in this project, which is a huge market demand. The annual demand of a prefecture-level city is more than one million sets of reserved hole hanging molds.

It's also a toilet. The drainage pipes for sitting and squatting are DN100If you have any questions, please add!

The highest against the wall is 420, and the nearest is 165, depending on what type of toilet you have. This data is in the GB 99S304. Basically, it depends on the distance on the drawing, and the toilet generally has more than 700 space.

Because I have to squat.

Actual 75-80 cm. The tubes are all the same size.

2 3mm each on the top and bottom and left and right.