Stove pipe horizontal qn

[jona]

Soon mn yurt will be set up.

I need some info about mn multi burner.

Qn 1 the horizontal double-walled pipe that goes from the stove through the yurt wall, how do I clean it from the shaft?

Qn 2 the chimney must necessarily be vertical or can it also be horizontal and then not a vertical pipe Does that possibly have to do with the flow of the stove or lack of flow of the gases?