I have never seen or used a boiler, but I am on the path to getting one. I can also get a lot of pallets for free. They will be broken down and full of nails. If I burn these pallets in my new boiler, what happens to all the nails that were in the pallets? They end up in the ash pile when I do this in my wood burning stove. But is this okay in a boiler? 2nd question. I want to put my new boiler in the basement which has 2 - 6" daimeter holes in the walls (near the ceiling). I planned on using one hole for the stove pipe and maybe the other one could provide some outside air to the boiler. I've just discovered that the flue on the boiler is 8" which makes me wonder if it's okay to put a reducer on the pipe so that it will go through my 6" hole in the wall. Is this a good idea? Is there another way to do this? I have LOTS of questions. Sorry if these first 2 seem sort of stupid.