I am so close to install day. One more issue to look at. My plumber has come up and looked at everything... he has decided on a placement for said Tarm 40. It will be about 10 feet from the SS manufactured chimney. My question is.. in the Tarm manual it says to only use 2 90's with 4 feet of pipe to connect it. Does this mean if I use 2 90's and the distance between the 90's is 10 feet that I will have problems? I could turn it so that I use only 1 90 instead. Would this be better? Help..