This fan assisted Mister unit runs on 12v 

Just add plain water to produce smoke / steam effect.
Adding that more realistic effect to your model
Variable fan speed to create prefered output rate
Dimension's
70mm Height - plus 80mm funnel ( SHORTEN TO SUIT )
116mm  Long  x  66mm  Wide 

Run Time :- estimated 20 - 30 minutes before top up required

Click on video link for demonstration of effect