I built burner opening on the side. I had a welder custom make the door, I planned this during the build. I really struggled with choosing the placement since I did not see any ovens with propane added.
My next Idea is to cut 2 fire bricks at a slant place inside of the oven to create a convection type oven sending the flame in a spiral as it hits the fire brick. I have not used the burner much yet to give feed back, except you see in photo of the burner flame is better than I thought flame would be this was my first try I could not wait to see how it worked. I have used this burner to start the wood fire.
I would say it helped start wood fire quicker. This burner is removable and the hose has a quick disconnect if I don’t use the burner, I just close the door.
the link below has several choices, I purchased the MR100 Burner what Ward burner suggested for use in most pizza ovens…
Ward Burner Systems
PO Box 1086