My stove has a rear vent. I have a 1 ft. pipe off the back hooked to a 90 then a 2 ft. section up hooked to the damper into another 2 foot section to a cut section about 1.5 foot to another 90 hooked to the powervent. My question....should I move the damper down to hook to the elbow then put the 2 ft. section above or is it ok the way it is? It seems I have read the recommendation is to hook the damper right into the 90 at the bottom. Will my current set up cause any problems? Thanks in advance for any insight!