This in turn prompted Johannes Potente to produce the FSB 1023

See European approval for flue gas sealing and noise reduction as well as installation instructions under related files

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When the door is closed

Together with the British designer Tom Dixon

fir Door Frame:Door frame k04 This in turn prompted JohannesA massive interior door made of laminated spruce and treated with hard wax oil. The natural surface of spruce is full of knots, giving it a vibrant and sturdy feel. The solid core contributes to better sound insulation, long lifespan, and a higher sense of quality for the door.