Where is the source of fresh air in hotel air conditioners?

Outdoor. When a hotel uses central air conditioning, the fresh air source of the air conditioner should be taken directly from the outside. It is prohibited to take air from the machine room, corridors and ceilings, so as to ensure that the fresh air source is clean. An air conditioner is an air conditioner. It refers to equipment that uses manual means to adjust and control the temperature, humidity, flow rate and other parameters of the ambient air in a building or structure.