Is it problematic to route the LAS from the gas condensing boiler through the bedroom on the upper floor? Does the LAS cause/transmit noises that disturb the bedroom? What are your experiences?
Why should that be dangerous? As long as the pipe is not drilled into, the exhaust gases escape outside. The exhaust gas temperature of a gas condensing boiler is low and inside the [LAS]. The boiler only produces noise in the heating room. Contact the responsible district chimney sweep during the planning phase to avoid surprises later.