Originally Posted by Wadaltmon
I doubt the heat of the reaction (unless you're speaking of something like a decomposition, which obviously this isn't, since CO2 is causing a composition reaction) would be enough to keep the fan spinning by shear heat convection. Also, there wouldn't even need to be a fan if the formula could simply react with CO2 to produce the web.
Oh... I just assumed that a fan would be needed to circulate the air to keep the CO2 in good supply, and the fan would be powered by a thermocoil, which refers to a machine that generates electricity using thermal energy, with two ends of a wire in two different temperatures(not heat covection).