What chemical equation proves that KHCO3 can extinguish a fire?

In a dry powder fire extinguisher, there is a chemical known as $\ce{KHCO3}$ and I was wondering how $\ce{KHCO3}$ works in a chemical equation to extinguish the fire.




According to [this](https://en.wikipedia.org/wiki/Potassium_bicarbonate) Wikipedia entry:



> 
> Decomposition of the bicarbonate occurs between 100 and 120 °C (212
>  and 248 °F):
> 
> 
> $$\ce{2 KHCO3 → K2CO3 + CO2 + H2O}, \Delta H>0$$
> 
> 
> 


So, you produce a nonflammable powder and two nonflammable gases, and you absorb heat from the fire in an endothermic reaction. 


The picture here is more complex than just a chemical equation however. The $\ce{KHCO3}$ also acts as an energy-absorbing material and provides a solid surface on which free radicals can be destroyed.


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