I don't want to say hello to the property because he won't help me repair the ventilator.

The property service company is responsible for the basic daily maintenance and maintenance of facilities and equipment used by the property company. It is not directly responsible for your so-called ventilator (exclusive area), and generally charges an appropriate fee for the maintenance of things in your exclusive area. There is no obligation to repair it for you unless the people in your property are very good or you have a good relationship. So,,,, you don't have to say hello to others for this, and even if people are obliged to help you repair it, they should say hello! My humble opinion @