Air extraction
If a connection to 100 mm diameter
piping is to be made, fit the reducer
piece (adaptor) supplied on to the
exhaust connection of the cooker
hood.
Push the ducting on to the cooker
hood exhaust connector or on to the
reducer piece (adaptor) and secure.
Note
If the exhaust ducting is to run through
rooms, ceiling space etc. where there
may be great variations in temperature
between the different areas the prob-
lem of sweating or condensation will
need to be addressed.
The exhaust ducting will need to be
suitably insulated.
In addition to insulating the exhaust
ducting it may also be necessary in
some cases to install a suitable conden-
sate trap to collect and evaporate any
condensate which may occur.
When installing a condensate trap
ensure that it is located vertically
and if possible directly above the
exhaust connection.
Calculation of extraction ducting
A pipe diameter of 125 mm should en-
sure trouble-free extraction up to a total
pipe length of 33 m.
Determine the total pipe length as fol-
lows:
Measure the total length of the ex-
traction ducting to be used.
Add the appropriate length of addi-
tional piping to this figure (see table),
according to the number and type of
bends:
Type of
bend
Angle of
bend
Radius of
bend
in mm
Length
additional
piping in
metres
Wall vent
duct with
grille and
flap
1.0
Smooth in-
terior wall
bends
90°
90°
45°
45°
125
250
125
250
0.3
0.2
0.2
0.1
Elbow
bend
90°
45°
2.0
0.5
Bend in
concer-
tina hose
90°
0.7
Flexible
piping
90°
90°
90°
45°
45°
45°
125
250
500
125
250
500
0.35
0.3
0.2
0.2
0.15
0.1
Connection for extraction
25
