Our house was remodeled last year and a fireplace installer did the job, put in a new 8" ceiling box and pipe for the existing stove to vent. Now, we're switching to a stove that takes 6" pipe and using a 'coupler' or 'reducer' to make the connection. Right now, the plan is to reduce the diameter of the pipe mid-way, at the 90-elbow. The entire length of pipe is about 6ft 6inches, give or take a few inches. We'd have 3ft of 8" coming out of the ceiling, 2 elbows, and 6" for the remaining 3-4ft to the stove. Also, my husband is ordering a damper for the 6" pipe. We're only using the elbows for clearance, not going through any walls or floors. It's aclear shot with minimum of 24" space. We'll be using the stove all winter long as our primary heat source. As much as this should be a no-brainer it truly is not and I need your help...if we mess up I'm afraid we'll be creating a safety hazard. The hope would be that it would create a stronger vacuum in the pipe and result in more heat retention but is that safe in a pipe? Our new stove is similar to a Baker (can't find info on the manu) and has a bypass-damper on it. I need your thoughts...is this a good plan? We're going to finally have the remaining stove pipe we need tomorrow, which is good since it was in the 40's here last night! Part of me thinks I need to just order more 6". Thanks for answering!