The tubing is small enough that the door seal just goes around it.
When I was first experimenting with it, I tried heating the oven with and without the steam tube in place and measuring heat with an infrared thermometer, there was no discernible difference in heat leaks by the tube.
Thanks, Allen, and welcome to My Nebraska Kitchen.
It's almost surprising to get a new signup that is a real person these days, I just deleted another dozen of them today, most with email addresses that were from Russia or otherwise suspicious.
I suspect more visible sites have many times more bogus signups.
.
