Third, the following aspects should be paid attention to:

1. The thickness of the bricks covered by the kitchen smoke pipe is 70mm-90mm (including the cement sand blasting, and the thickness of the blasting is controlled at about 1.5cm). It should be noted that the smoke stop valve at the upper end cannot be sealed. When installing the smoke machine pipe, it is necessary to connect the smoke stop valve, which can prevent the oil smoke from other owners from rushing back in, because the smoke exhaust pipe of the same building in the community is shared.

2. The bottom of the caisson should be sealed (bricklaying and cement mortar) to prevent peculiar smell from recoiling to the top of the pipeline; the thickness of the bricklaying should be 70mm-90mm (including cement sand and sloping) The thickness should be controlled at about 1.5cm. If there is also an inspection port in the middle of the toilet pipeline, when the bricks are laid with 110 pipes, a square inspection port of no less than 130*130mm should be reserved in the original inspection port of the sewer pipe, which is more convenient for later problems to open for inspection.