Exhaust heat relative to a car's (drives how hard the smoke rises).
Opacity at full output, 0…1.
Particles per second per vent at full output.
Puff size at the outlet, metres (puffs grow over their life).
Gas exit speed out of the outlet, m/s.
0 = clean white (steam, condensation) … 1 = dark soot.
How one kind of vent smokes. Plain JSON.