(57) A fresh air valve (1) which comprises an elongated housing (2) with an elongated
slot shaped through flow opening (21) for building into elongated slot shaped openings
in walls or frames, for example window frames, the through flow opening comprising
two end walls (22,23), one end wall arranged at either end of the through flow opening,
and an elongated cover plate (3) which is displaceably arranged in the elongated housing
to be displaceable between two positions, a closed position in which the through flow
opening is closed and an open position in which the through flow opening is at least
partially open. The elongated cover plate comprises two engagement elements (41),
one arranged at either end of the elongated cover plate and both arranged inside the
through flow opening, the elongated housing comprises two locking mechanisms (40),
one arranged at each end of the elongated housing and both arranged outside the through
flow opening and the locking mechanisms engage with the engagement elements of the
elongated cover plate through two small openings (45), one small opening placed in
each end wall of the through flow opening. In this way a fresh air valve is provided
with a well functioning and simple way of locking the cover plate in its closed position.
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