1.5
1.0
0.9
0.8
0.7
0.5
0.6
0.4
0.3
0.2
0.15
0.1
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
AIR FLOW RATE m
3
/sec.
70
60
50
40
30
20
SOUND LEVEL dbA
GRILLE TOTAL PRESSURE N/m
2
TYPE 'B'
TYPE 'B'
70
60
50
40
30
20
5
4
3
2
1.5
1
40
30
20
10
5
4
3
2
1
100
5
5
50
40
30
20
10
TYPE 'A'
TYPE 'A' TYPE 'B'
TYPE 'A'
SOUND LEVEL dbA
GRILLE TOTAL PRESSURE N/m
2
JET VELOCITY
200x100
250x100
300x100
350x100
200x200
400x100
250x200
300x200
350x200
400x200
300x300
350x300
400x300
400x400
200x100
250x100
300x100
350x100
200x200
400x100
250x200
300x200
350x200
400x200
300x300
350x300
400x300
400x400
TYPE 'B'
TYPE 'A'
GRILLE SIZES
Nomogram
Example
Type
Volume
Sound Level
Jet Vel Pressure Drop
A
0.2
36
2.8
14
B
0.2
45
3.3
46
10
SMOKEGARD
Door, Wall and Partition Mounting Smoke and Fire Dampers