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