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Aspirating Smoke Detector
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
a = Acceleration openings = 7.0 mm
See also
–
4.11
Planning for Forced Airflow
Monitoring the air-conditioning ducts
Air-conditioning units are broken down into low and high-speed units (see table below). The
details provided in this chapter apply only to low-speed units. There are no adequate empirical
values available for high-speed units. Hence, smoke trials must be executed for air-
conditioning ducts with flow speeds above 10 m/s, in order to determine optimal response
behavior.
Air-
conditioning
ducts
The speed distribution in an air-conditioning duct appears as follows:
Bosch Sicherheitssysteme GmbH
7.0
3.6
3.0
a
7.0
3.6
-
a
7.0
-
-
a
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2. Option: reducing the number of air sampling openings, page 61
Flow speed
Duct cross-section
Difference pressures
along the flow
direction
3.0
2.5
2.5
2.5
3.6
2.5
2.5
2.5
3.6
3.0
2.5
2.5
6.0
3.6
2.5
2.5
a
6.0
3.0
2.5
-
a
6.0
3.0
-
-
a
6.0
-
-
-
a
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Low-speed units
Maximum 6 to 10 m/s
Large
Low
Operation Guide
Planning | en
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
3.0
2.5
2.5
2.5
6.0
3.0
2.5
2.5
a
6.0
3.0
2.5
-
a
6.0
3.0
-
-
a
6.0
-
-
-
a
-
-
-
-
High-speed units
> 10 m/s
Small
High
2018.04 | 2.0 | F.01U.130.926
69
2.0
2.0
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
3.0
6.0
a
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