Combination of ventilation of a geyser and a kitchen hood

Hello, Oksana. According to the norms of SNiP 42-01-2002, as well as the rules of fire safety, connecting to a single channel of a gas column and hood is prohibited.

According to the regulations:

- The gas water heater must have an individual chimney;
- There should be a window with a window in the kitchen.

In this case, you have two options:

1. Mount a sorption hood that does not use a fan; special cleaning filters are used.
2. Mount a conventional hood, but make a separate ventilation duct for it.

I think that the second option will be more practical, since it’s a vent. the channel from the hood to the street is not so difficult. Do not forget to mount the non-return valve so that cold air does not enter the apartment when the hood does not work.