Earlier this year I read about that foam insert you can put into your AC discharge to direct the cold air into the ductwork better and wondered what it looked like in ours and found a mess in the intake plenum. First off why would the junction box be mounted directly in the air flow blocking 20-25% of the surface area? Worse was the wiring mess that extended up into the plenum, the excessively long wiring was just shoved up in there and buttoned up good to go. I turned the junction box sideways and got the wiring in some semblance of order now have to find some screw down clamps and maybe some electrical tape and the AC unit will be able to flow as intended and hopefully be quieter Also silver taped up gaps where the conditioned air could short circuit back to the intake and into the gap between the ceiling and roof. Amazing, and Grand Design has a rep of being a cut above average.