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23
Duct Air Leakage Tester Operation Manual Ver.3
C
0.003 × P
.
1000
750
400
1000
2000
D*
0.001 × P
.
1000
750
400
1000
2000
* Class D ductwork is only for special apparatus
3. EU Standards Dw/143
Duct Pressure Class
Static Pressure Limit
Maximum Air Velocity
m/s
Air leakage limits
l/s/m
2
Positive Pa
Negative Pa
Low-pressure – Class A
500
500
10
0.027 × P
.
Medium pressure – Class B
1000
750
20
0.009 × P
.
High pressure – Class C
2000
750
40
0.003 × P
.
4. EU Standards Eurovent 2/2
Air Tightness Class
Air leakage limit (fmax) m
3
/s/m
2
A
0.027 × P
.
1000
B
0.009 × P
.
1000
C
0.003 × P
.
1000
5. US Standards SMACNA
Duct Class
1/2-, 1-, 2-inwg
3-inwg
4-, 6-, 10-inwg
Seal Class
C
B
A
Sealing Applicable
Transverse Joints Only
Transverse Joints and
Seams
Joints, Seams and All Wall
Penetrations
Leakage Class
Rectangular Metal
16
8
4
Round Metal
8
4
2
Maximum air leakage is then defined as
F=C
L
P
0.65
F
=
Maximum air leakage (cfm/100 ft2)
C
L
=
Leakage class
P
=
Pressure (inwg)