For apartments and offices there is already a proven methodology of ventilation systems. So get bother and relax. The air is supplied only through the living part, or rather that the bathroom, the kitchen is not suitable. There is a standard that 3 square meters of air are needed by 1 square meter of the area of the room. Now we multiply the area by 3 and we get how much we need. There should be as much exhaust air as the supply of supply, it requires standards. But it is better if you do not understand this, then provide calculations to specialists.
