Question about Tristar Ac-5531

Yes, exactly, every mobile air conditioner should be supplied with an exhaust hose up to 2.5 metres long with a diameter of 15 cm. This is the case with all TRISTAR mobile air conditioners.
The exhaust air hose must always be led out of the room to be cooled to the outside in order to dispose of the warm air.
A TRISTAR window kit (AC-5555) can be purchased as an additional item to prevent insects and dirt from entering when the window is open.