This reminds me of the pigeons that used to sneak their way into our Ray Paul up in New England. They make a disturbing sound when firing up on Monday mornings.
The sound is one thing, cleaning it out so it will run again is another. Been there a couple of times...
Steve
If you use flex hose, make it metal instead of a dryer hose, sheet metal real venting is best. Also remember, every angle adds resistance, like adding more feet of pipe, so don't get a bunch of angles in there or it will back up into the dryer (like the banana in the tailpipe from Beverly Hills Cop)