What doors to use for a "boiler room"?

We have a boiler in a hallway/room area towards the back of the house. We need to replace the doors the enclose the area. right now that are wooden Louvered doors. Do i NEED to use those kind since they are pretty hard to come by? im thinking if i use normal doors then it will get insanely hot back there when the boiler is running. Also it will trap heat back there instead of spreading it to other rooms.