Seems that I run into the flue bandit more often than the run cap bandit in my neck of the woods.
Apparently there is no need to carry 3" or 4" pipe. Just spin some 5" down and screw it together. Kinda like 1 size fits all.
Looks like they crimped that 5" with a pair of needle nose pliers, and yes a few of those joints are backwards. Not to mention that in this application it should have been type "B".