Duct sizing chart pdf

Page 1

FRICTION CHART FOR AIRFLOW IN DUCTING (SEA LEVEL) 100

100

VE LO C 30 ITY,

70 50

m/ s

m/ s

40 30

20

50

18

80 10

40

12

5

14

7

0 25

9

10

30

0

10

7

35

12

20

16

0

10

20

45

16

0

20

5

5

5

8

4

31

4

70 50

70 60

63

30

0

7

3

3

40

0

6

50

2

2

0

5

80

0

63

00

4

1

3,5

50

00 16

2,5

0,5

25

00

2,0 1,8

0,3

1,6

0,2

0,3 0,2

DU

1,2

0,1 20

0,4

CT

1,4

31 50 DIA ME TE R, 40 mm 00

0,4

20

00

0,5

0,7

12

3

0,7

1

10

FRICTION LOSS, Pa/m

80

26

50

40

VE LO 90 CITY ,

50

100

200

500

1000

AIR QUANTITY,

Friction Chart for Round Duct (

2000

5000

10 000

20 000

50 000

100 000

0,1 200 000

/s at 1,20 kg/m³

= 1,20 kg/m³ and

3=

0,09 mm)

Chart from ASHRAE Handbook of Fundamentals 1997 (Pg 32.9)


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