just about ready to install this harman accentra that my uncle gave me its in like new condition I am changing the vent pipe now I know everyone has ther own thoughts on this but I want to do it once and thats it. #1 what pipe is the best and should I use tape and silicone on all the connections? #2 should I buy the appliance adapter? #3should I do an OAK? is this needed with a harman?and the biggest one of all in which I am getting the most confused with the dealer by me is telling me to just vent it straight out behind the bushes and just clear out about 18 inches around the bushes and put a cap pointed down that just dont seem right to me I was going to go out than put a cleanout tee and go up about 4 feet above the hedge row than cap or go with black pipe inside and go up 3-4 foot than out about a foot and cap I am counting on you guys for some help here as its time for me to go to the cabin hunting and I want to get this install done. Thanks in advance Tom p.s. also a good company to buy the pipe and related parts from would be great