It’s difficult to tell from the limited info given on that site but I must admit it does look like a tube; however, I can’t believe Hotpoint would be so stupid to limit an external extract hood to roof exit only, I’m certain it must be possible to go through 90 degrees out the wall. I tried a quick Google for some technical information but no luck & suggest this is what you need to spend more time on before you buy; try the Hotpoint web site. Also check all the on-line prices as I think you may be able to get it cheaper than that!