Pressure Class B 1000 Pa

DUCT LONGEST SIDE (MM)

GUAGE (MM)

JOINT RATING

DUCTMATE FLANGE
STIFFENER (1)

MAX LENGTH (2) WITHOUT STIFFENER

Up to 400

0.6

J2

20 / 25

S2

3000

401 to 600

0.8

J2

20 / 25

S2

1600

601 to 800

0.8

J2

20 / 25

S2

1250

601 to 800

0.8

J3

30 / 35

S3

1600

801 to 1000

0.8

J3
30 / 35
S3
1250

1001 to 1250

1.0

J3

30 / 35

S3

800
1251 to 1600
1.0
J4
30 / 35
S4
800

1601 to 2000

1.0

J5

45

S5

800

2001 to 2500

1.0

J5

45

S5

800

2501 to 3000

1.2

J6

45 with Tie Bar

S6

625

Over 3000

Contact Ductmate (Europe) Ltd

(1) For Stiffener ratings refer to DW144 Page 23, Fig. 18 - Fig. 23.

(2) All maximum lengths are based on stiffened sheet ducts.