Hi friends, We all know that chimneys are used to suck up smoke from a house's fireplace, in order for the smoke not to spread all over the house. But I wonder if I can use a pipe with a wide open end to create a similar effect outside the house? The following picture demonstrates what I mean (sorry for the bad drawing): For example, when cooking outdoor, I don't want the smoke to spread out which can be annoying to my neighbours, can I just use a pipe like the one in the above picture to 'suck up' the smoke? And if the answer is yes, please explain to me which physics laws/rules can be applied here. Thank you very much. Riscilla.