In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
We have 2 Reznor F-100 unit heaters that share a common 7" b-vent that extends through the roof with a rain cap. The units are no more that 30" apart. The unit that connects to the branch of the 7" tee is cutting out on high limit. if i replace the tee with a wye and 45 and lengthen the piece on the roof will that help with drafting. We have 4 other units that are individually vented and we are not having this issue with any of them.
edit: these pictures are all rotated 90 degrees counter clockwise, I don't know how to rotate them before attaching