I just got my brand new T6 and I noticed that the rear clearance for double wall pipe installation has changed from 6 inches to 7.5 inches. Does anyone know why this has changed? I've included a pic of my stove waiting on the hearth pad and pipe. This is where it is going. My central air intake, if you notice, is just to the left. I should be able to just turn on the fan to distribute heat throughout the house if need be. I had a T5 in my last house. I can't wait to be warm again!