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3a: Requirements for AHU installation location
(only applicable for indoor installations)
Zone 3: Out of scope standard
80
70
Zone 2:
Additional ventilation
in the installation
60
location required
50
40
30
20
10
0
0
25
50
75
A or
A
[m²]
m
[kg]
tot
inst
c
6
2.0
10
3.4
15
5.1
20
6.8
25
8.4
30
10.1
35
11.8
40
13.5
45
15.2
50
16.9
55
18.6
60
20.3
65
22.0
70
23.6
75
25.3
80
27.0
85
28.7
90
30.4
95
32.1
100
33.8
105
35.5
110
37.1
115
38.8
120
40.5
3
Zone 1:
No action required
100
125
150
175
200
A
[m
]
2
inst
A or
A
[m²]
m
tot
inst
c
125
42.2
130
43.9
135
45.6
140
47.3
145
49.0
150
50.7
155
52.3
160
54.0
165
55.7
170
57.4
175
59.1
180
60.8
185
62.5
190
64.2
195
65.9
200
67.5
205
69.2
210
70.9
215
72.6
220
74.3
225
76.0
230
77.7
235
79.4
236
79.7
3b: Requirements for spaces served by AHU
Zone 3: Out of scope standard
80
70
Circulation airflow
60
Mechanical extraction
50
40
30
20
10
0
225
250
0
25
50%LFL×H×(A
260LFL
[kg]
Zone 2:
+
Zone 1:
Only circulation
airflow required
50
75
100
125
150
A
[m
]
2
tot
or A
) (valid for m
>1.84 kg)
tot
inst
c
175
200
225
250
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