Patent ID: 8459618

Claim:
A humidity conditioning air system for a pneumatically driven device in which supply air from a compressed air source is supplied to the pneumatically driven device through a pneumatic line, wherein: a humidity conditioning tube is connected to the whole or a part of the pneumatic line between the compressed air source and the pneumatically driven device, the humidity conditioning tube being constructed by a polymer material having moisture selective permeability in both inward and outward directions according to steam partial pressures in and outside thereof; the humidity conditioning tube has a diameter that can be used as piping for a general-use pneumatic system and is placed in the atmosphere; and the supply air supplied to the pneumatically driven device through the humidity conditioning tube is dehumidified or humidified between the supply air and the atmosphere via the humidity conditioning tube by the moisture selective permeability in both the inward and outward directions in the humidity conditioning tube.