I have been slowly growing my business for about 4 years and am just now buying a combustion analyzer. I know that you guys are probably going to tear me up and call me a hack for not owning one yet, but I've been accumulating other tools and figured I could get by with timing the meter and some other measurements. So, when you're done with any insults you want to toss out there could you tell me how you are getting flue gas analysis on systems with B-Vent? Or for that matter, how about the 90 plus systems? I don't want to breach the integrity of the vents.