1. The reserved hole size of kitchen and bathroom smoke exhaust pipeline is determined in civil construction: after the prefabricated rectangular flue is completed, the hole edge of each floor is the support of the flue. Only circular thin-walled ventilation pipes can be supported on the wall.

Second, if it is less than 300mm, the ruler with holes in the floor should be enlarged by 30 mm. Flue refers to the pipe used to remove smoke or pollute the air in the kitchen and bathroom, and is the main component of the exhaust pipe system used in the kitchen and bathroom of the house.

Third, the application principle When the flue gas from the air inlet is discharged into the flue, it will meet the flue gas discharged upward from the lower layer. When two air streams meet, a vortex and an air curtain will be formed, which will hinder the upward movement of the lower flue gas. Once the fire check valve is stuck by oil pollution and cannot be opened, the smoke will string up indoors because of its upward movement.

I hope it helps you!