Tower of a wind turbine, having a hollow inner space and a door (9) for opening and closing an aperture into the inner space, characterised in the door (9) is a sliding door (9), which is slidingly arranged on a tower aperture member (4) attached to the tower, and which sliding door (9) is at least partially sealed by sealing means to the tower aperture member (4) at least when the door is in the closed position.
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