Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Concentric Termination extension
I just had a new High efficiency gas boiler installed. They used a single pipe for venting fresh air in and exhaust out with a concentric terminator kit. But they also added a "periscope" type pipe to the end of the terminator - to get clear of mounting snow I suppose. I was under the impression a concentric termination was carefully engineered to maximize the exhaust and intake air currents. My question is this - now that the concentric terminator is no longer technically the termination - is it still able to do it's job with two elbow joints and 30 inches of pipe in front of it?