I am thinking that a post process shader might be a better choice for a smoke effect inside a room.
Check out the test build in the download button.
Make copies of the original Multi_1.dds file and multi_2.dds. when you copy these effects into you effectbank\postprocess folder
I called this from the multi post process shader script in a trigger zone.
I would use a few dim lights in the room such as deep red, red orange, yellow to create the flame glow on walls. Have them as dark as possible but just light enough to see. Placing the trigger zone in front of the door instead of inside the room would probably be better as the effect would be in process as you open the door not after you enter the room.
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