Club Smoke Vents
On this page you are buying the smoke vent featured in the icon above
These are small particle effect smoke streams that you can replicate a few times to create effects around your rooms, try it to test.
The smoke vents come in an assortment of colors, you can even derive your own if you develop and make a new color ( For developers, particle name is: flame.png )
Here is some of the other colours you can get