The Combustion Chamber is a multiblock structure added by Embers. It is used to power the Ignem Reactor. When placed, it forms a two-block tall multiblock structure, expanding upwards from where the chamber was placed.
The Combustion Chamber must be connected to Ignem Reactor to work. To start, place the Ignem Reactor next to the top block of the structure. It will then automatically connect. Then you must supply the Combustion Chamber with combustible fuel using Item Pipes and Item Extractors to the bottom block. Note that you cannot manually insert the fuel.
The Combustion Chamber increases the amount of ember produced depending on which combustible fuel that is used.