I upgraded to and Englander 30 from my Drolet Savannah last week. The drolet was a great stove, but I needed something bigger and the englander fit the bill in more ways that one. I have also decided to install and OAK with the new stove, which is something that I have thought about but never got around to doing with the Drolet. I do have a couple questions though and hopefully you all can help me out. First of all, what do you use to cut through the ceramic tile/cement board when going down to the crawl space? ie...what is the most tried and true method? Also, my old drolet manual called for a 4" flex pipe for the OAK, whereas the englander (double firebox volume) manual only calls for a 3" flex pipe. So, that being said, is a 3" diameter pipe necessary to feed the stove? Can it be 2"? 1"? If the diameter of the OAK pipe is smaller wouldn't the chimney draft just draw outside air through the smaller pipe at a higher velocity? Anyway, I would like to do this in the next few days, so your guidance is appreciated!