I noticed the other day that the guy who installed my pellet stove installed the pipe in backward if you can do such a thing. It's duravent pipe. I seen on the bottom of the pipe a sticker with a arrow pointing for the direction of flow. Looks like he used the small end of the pipe on the stove to avoid using a adapter on the stove. The direction of the flow arrow is pointing toward my stove. Will this affect the way the stove burns or vent? It seems to run OK like that.