If it’s like my 3801 TS XL it is tied into the same hole all the red and blue pex piping comes through. Take out your bottom right drawer and you can look behind the electrical panel and see the duct. As packed as that hole is, I don’t think much heat can get through!
Not really sure why there could not have been a separate hole for the heat duct. There is plenty of room.
Joe & Cynthia
2021 Dynaquest XL 3801 TS Cindy 'B'
2021 Jeep Wrangler Unlimited Rubicon Diesel
“Breathe in, Breathe out, Move on”