Fireplace without fireplace

We build next to fireplaces also fireplaces without fireplace. We also build so-called corner fireplaces, also with original flint.
Attractions include a fireplace pit in the floor or an ash pan and grate? A combustion pit is a recessed portion where the ashes left after firing. Before we do this, we will of course examine whether bint layer of the floor does not extend into the cannon / boiler section. If this is the case then we can adjust the foundation so that a combustion pit is nevertheless possible, or install an ash pan / grid. With underfloor heating, you are required to take an ash pan / grate this in connection with the possible melting heat long.