[Stefrobrts]

I got brave enough to go light my furnace and water heater to test them out (first time since the PO showed me how), and managed to do it with only one small incident where nobody got hurt but we all gained a little more respect for propane! However, once I got the water heater going, I was reading the manual and I see it says a noisy blue flame indicates too much air, and I should adjust the 'air shutter'. It is a very noisy blue flame, but I have no idea what the air shutter is. Can anyone clue me in?