As far as I could see, this is not specified. However, it does say in the description:

"To prevent too much warm air from entering the room from outside through the opening required for the hose, the outlet should be as small as possible and located higher than the air conditioner. The easiest way to achieve this is to hang the end of the hose from a tilted window."

If you want to use it with the Electrolux window kit EWK04 (which is linked as an accessory), you should follow the specifications in the description of the window kit.