(57) A baffle for sound absorbers intended for rectangular ventilation ducts. The baffle
(10) has a rectangular shape when seen sideways on and also when seen in vertical
cross-section transversely to the longitudinal direction and includes sound absorbing
insulating material (20, 21) supported by a frame structure or casing (14, 15). The
baffle is characterised in that it includes at least two juxtaposed, generally parallelepipedic
baffle-parts (16) which are mutually spaced at least at one end thereof and which
contain sound absorbing insulating material (20) and said insulation-material supporting
frame structure or casing (14, 15). There is provided at each outer end of the baffle
(10) a respective vertically extending edge-piece (12 and 13) which connect and hold
together said baffle-parts (16). At least one edge-piece (12) at the outer end of
the baffle (10) which meets the ventilation air has an air-flow deflecting shape.
The baffle-parts (16) can be given a predetermined position in relation to one another,
by appropriate selection of the edge-pieces (12), so as to form spaces (17) between
two mutually adjacent baffle-parts (16). The baffle-parts (16) are conveniently disposed
obliquely in relation to one another, so that the baffle (10) will be thickest at
that end which is to be positioned to meet the air flow in the ventilation duct. At
least one space (17) between the baffle-parts (16) shall be filled with an appropriate
material (21).
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