We have lots of wood stoves up here. The less ambitious outdoor types use pellet stoves. Those with even less ambition, vent their pellet stove in the following manor!
Thanks , I guess they want it is go down hill to drain the condensation ???
Doesn’t look like its been used often. The whole thing seems weird.
Actually you are wrong about the photo.
That is a new device created to kill wall weeds.
Maybe I should offer wall weed inspections as an ancillary service Bob.