changing or repairing the kitchen vetilation and bathroom ventilation

Hei My apartment has old Villavent ventilation for kitchen and bathroom. Basically the ventilation on the kitchen has two pipes to suck air from kitchen and bathroom. one of the motor of the ventilation is broken and there is much humidity in the apartment. I need a company to investigate and suggest if I have to mount electrical fan for bathrrom ventilation and should I change the kitchen ventilation and which type does it match, and if with a good ventilation on kitchen, I don't need electrical ventilation for bathroom? Looking forward to hearing your advise and offer. Kindest regards Mehdi