RBI
The RBI Winter/Summer diffuser is desi-
gned to supply air into industrial premi-
ses, stores warehouse and sport halls
with very high ceilings.

Design
The RBI diffusers are made from steel
which is powder coated with standard co-
lour RAL 9010, available in 7 sizes. The
connections to the air duct system are
round and of standard size, with rubber
seals.

Operation
The major elements of the unit are the two cylinders placed one
inside the other, with openings in the bottom and sides. The
position of the openings ensures two basic operating modes. In
one case, the bottom openings remain open and the side ope-
nings remain closed. Conversely, in the second case, the side
openings remain open and the bottom ones remain closed.
The distribution of air between the bottom and side openings
can be adjusted continuously by rotating the internal coaxial
cylinder with the outer one.
If the diffuser is placed close to the ceiling with vertical axis,
the flow of air from the bottom is perfect for winter heating,
while the flow from the sides can be used for summer cooling
without the current of air blowing directly on the occupied area.
The internal pressure drop pratically does not change during
the opening and closing of the openings. This means that you
can change the air flows without having to adjust the air flow
volumes. The RBI diffuser has no damper, so the air volume can
be adjusted with volume control units installed in the air duct
system. On request, the diffuser can be supplied with internal
drilled steel sheet equalizer .

Adjustment
The adjustment of RBI diffusers, i.e. the rotation of the inside
cylinder, can be performed manually or with an electrical servo
motor placed outside the upper plate. You must specify whether
you require manual or servo-motor adjustment at the time of
ordering. Any subsequent modifications can only be done by
the manufacturer.

Fitting
The RBI diffusers must be hung. The smaller sizes (up to 315)
can be fixed to the air duct with self-tapping screws or with pop
rivets, if the duct is strong enough and fixed securely. For sizes
of 400 and over, we suggest you use 3 fixing points prepared
for M8 bolts.