1. If a fan is equipped, the theoretical value should be 45,111 to 511,111,111 air volume, and the smoke collecting pipe should be 1 m * 1.25m. Of course, it is necessary to change the diameter if a fan is installed at the end of the flue.

2. If there is space, it is recommended to provide two or more sets. If you don't use the stove, you don't need to turn on so many fans, which is a waste of electricity.

3. It saves a lot of trouble to exhaust fume from the roof, and it may also save fume purification. The total pressure depends on the fan. Straight pipe is enough, and full pressure and noise are also loud.

If we are in Hubei, we can talk. Good luck!