I'm sorry if I'm dragging out old ghosts, cause I know this question has been brought up on this site. I can't seem to locate it. Maybe some newbies will also benefit from this topic.
I've just installed a baro/MPD assy, and put the MPD in frt of the baro. My reasoning goes like this. When I just ran an MPD, even with it fully shut, my draft was still higher than the manufacturers recommendation of -04. So I've purchased a baro and installed it "downstream" from the MPD. In this location, I was hoping to close down the stove pipe with the MPD, to retain heat, and the baro, being behind it will maintain my draft to manuf. specs. However, after watching a video of how to operate my stove, the narrator shows his MPD mounted "after" the baro. I was assuming in this position, if I shut down the MPD to retain heat, the exhaust would escape into the house thru the loosely fitting baro door. Am I missing something?