Is it legal to install toilet exhaust pipe on public stairs?

If it is illegal, the public * * * area belongs to * * * property and cannot be occupied for personal reasons, and exhaust pipes cannot be installed.

Public * * * area refers to the area owned and used by all house owners within a limited scope. The public * * * area consists of two parts: the * * use part and the public * * * facilities. For example, the definition of * * * common parts and public facilities in Shanghai Residential Property Management Regulations is: "* * * common parts refer to the foyer, stairwell, water pump room, electric meter room, elevator room, telephone branch room, elevator room, corridor and communication room used by the owners and users of the whole house."