(57) A door of a building comprises a frame (10) and a door leaf attached with hinges
to the frame. The frame has an outer side surface (12) and an inner side surface (14),
which are at different levels. The door leaf has an edge surface (22), which settles
beside the outer side surface of the frame when the door is closed. A seal (30) is
attached to the frame, which seal has a sealing surface (32) settling against the
edge surface of the closed door leaf. The sealing surface has a first edge, which
is substantially at the same level as the outer side surface of the frame, and a second
edge, which is substantially at the same level as the inner side surface of the frame.
The first edge and second edge are arranged to remain substantially unmoving in relation
to the side surfaces of the frame when the door is opened and closed. The seal can
be a flexible band-like part, which is attached by the first edge of the sealing surface
to the outer side surface of the frame and by the second edge to the inner side surface
of the frame, so that a substantially closed edge cavity (42) remains between the
sealing surface and the frame surface. The seal can also be a flexible and compressible,
substantially solid seal or a so-called cavity seal, inside which there is a cavity
in the longitudinal direction of the seal.
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