Venting gen exhaust thru RV garage, need suggestions please.

I used dryer hose thru the garage wall because it is flexible. I then attached a coffee can over the free end sliding the dryer hose all the way in and fastening with several layers of duct tape. I cut a hole in the other end of the can just SLIGHTLY larger then the gen exhaust pipe. The can/dryer hose assembly can slide over the exhaust about 6or8 inches. because the hose is flexible it can adjust for not parking in exactly the same place all the time