Can the riser of indoor gas pipeline pass through the ventilation pipeline?

If the two do not affect each other, they can cross.

Is the indoor gas riser the section behind the gas meter? If there are, they are all low-pressure pipelines, and it is no problem to cross them, as long as they do not touch and do not affect the safety of gas pipelines.

Is the air exchange ordinary air or hot air from waste water heaters? If it is high temperature flue gas, it is best to stay away from the gas pipeline for more than 30cm.