The only way to vent the cooking hearth was through trap doors in the roof. How apt is Tolkien’s description?: “The travelers entered. Inside it seemed dark and warm after the clear air upon the hill. The hall was long and wide and filled with shadows and half lights; mighty pillars upheld its lofty roof. But here and there bright sunbeams fell in glimmering shafts from the eastern windows, high under the deep eaves. Through the louver in the roof, above the thin wisps of issuing smoke, the sky showed pale and blue.”