(57) The present invention relates to an air guide (1) for introducing replacement air
into a room (6). The air guide (1) comprises at least a first wall (1.1), a second
wall (1.2), a first end (1.3), a second end (1.4), an air flow duct (1.5), and a backflow
trap (7) placed in the air flow duct (1.5). The air guide (1) further comprises a
limiter (8) for restricting the movement of the backflow trap (7), wherein the amount
of replacement air flowing through the air flow duct (1.5) is arranged to be adjusted
by changing the position of said limiter (8). The invention also relates to a replacement
air valve (9) and a window (3).
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