A device for recovering air from an aspirator comprising a conduit (3) for transporting a mixture of compressed air and a sterilising agent, connectable through an inlet thereof (3a) to an outlet (4a) of compressed air of a pump (4) of the aspirator, a dispensing terminal (7) of the mixture connected to an outlet (3b) of the conduit (3) and a tank (6) containing a sterilising agent in fluid communication with the conduit (3) through a collection section of the sterilising agent.