Sharing this video by Chuff testing the Manhattan as I feel it shows exactly what the makers should have explained at the start.
I would like to remind you that the whole 35psi venting is not mentioned anywhere when I did the review, it was only after my review that we found out how it was supposed to vent!!
I asked the maker twice after my review to give me detailed info so I could pass it on but both times was threatened with legal action!
Thanks to Chuff for doing this video.