How to draw Air
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 I am trying to illustrate hot air flow as shown by the translucent orange color. The second picture shows something similar - but not quite - of what I am trying to achieve. Any ideas on how to do this would be appreciated. 
  
  
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 Another picture: 
  
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 You could use some semi-transparent png image like (made on another occasion) in this model: http://sketchup.google.com/3dwarehouse/details?mid=ed6d520e6fb1c534c045bcbc26359030&prevstart=0 
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 You may like to have a go with HTML5 canvas. I have been using the KineticJS library which makes things much easier. You could create the smoke effects using the shapes, shaders and filters there and make a png image overlay with its dataToUrl method. You can do it manually or use JavaScript to set up criteria to generate it (if varying conditions were important). 
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 Gai....Very nice! Going to try that. Chris....Never heard of that before. Will check it out. Thanks to both of you. 
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