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Air extraction
Push the ducting on to the cooker
hood exhaust connector or on to the
reducer (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 (5’’) should
ensure trouble-free extraction up to a
total pipe length of 33 m (108’’).
Determine the total pipe length as fol-
lows:
Measure the total length of the ex-
haust 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
Length of
additional
piping
in inch in mm in foot in
metres
Wall
vent
duct
with
grill
and
flap
3,3’ 1.0
Smooth
interior
wall
bends
90°
90°
45°
45°
5
10
5
10
125
250
125
250
1
3/4
3/4
1/2
0.3
0.2
0.2
0.1
Elbow
bend
90°
45°
6 3/4
1 3/4
2.0
0.5
Bend
in
rent
hose
90° 2 1/2 0.7
Flexible
piping
90°
90°
90°
45°
45°
45°
5
10
20
5
10
20
125
250
500
125
250
500
1
1
3/4
3/4
3/4
1/2
0.35
0.3
0.2
0.2
0.15
0.1
Air extraction
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