S4-34760_Venturi-Air Duct Kit
4188-971_issue 1_07/09_duct sensor kit
9
2.4 Mounting
Î
Venturi tubes between 600 mm and 2800 mm
To mount the air duct (with or without the optional mounting kit Part No. S4-34760-99) with a pipe length of
more than 600 mm the air duct must be drilled at two points as shown in the figure.
Mounting information!
Drill a hole (
∅
38mm) in the air duct and deburr the
borehole.
upper hole
Î
∅
38 mm
bottom hole
Î
∅
50 mm
Cut the Venturi tube to the required length
(refer Section 2.5 „Adapt the Venturi tube length“).
Seal the borehole of the air duct on the lower end of
the Venturi tube with the supplied plastic gasket
(use only Part No. S4-34760-15 / S4-760-28).
Insert rubber gasket in the lower borehole of the air
duct (
∅
50 mm).
Close the end of the Venturi tube by means of
the supplied sealing cap.
ai
r d
u
c
t
di
am
e
ters
be
tw
een
60
0
m
m
a
n
d
2
7
0
0
m
m
B
e
c
aus
e o
t i
ts
l
e
ng
h
t, t
he
V
e
nt
u
ri
tu
be
h
a
s
to
b
e
su
pp
o
rted
in
the
o
p
p
o
s
ite
si
de
o
f th
e
ai
r du
c
t.
Hole
∅
50
mm
Direction of
air flow
Hole
∅
38 mm
30
The Venturi tube should not protrude by more than
30 mm above the air duct.
Fig. 13: Venturi tubes between 600 mm and 2800 mm
The Venturi tube must be about 30 mm longer as the diameter of the air duct.
Observe distance caused by the optional mounting kit if required!
Refer to section 2.6 “Mounting the Venturi tube”!
www.acornfiresecurity.com
www.acornfiresecurity.com
