old tiny trailer heater question

Dragged out my heater, it is missing the outside piece that I believe keeps the rain out. I can guess what it looks like, and here is what I have.
If someone has a picture of the missing piece I would be thankful. Could I recess the whole mess and put a vented cover over it? It appears to have both an intake and exhaust in it.
del
If someone has a picture of the missing piece I would be thankful. Could I recess the whole mess and put a vented cover over it? It appears to have both an intake and exhaust in it.
del