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Ventilation Tee Pressure Loss, 45° Angled Branch, Diverging
Local pressure loss calculation for a tee fitting with a 45° angled diverging branch connected to a rectangular duct in a ventilation system, based on the 2001 ASHRAE Fundamentals Handbook (C34).
Unit System
SI (Metric)
Imperial (US)
Flow Rate (Q
s
)
m³/h
L/s
Flow Rate (Q
b
)
H/W ( mm)
25
50
75
100
125
150
175
200
225
250
275
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
1250
1300
1350
1400
1450
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
25
50
75
100
125
150
175
200
225
250
275
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
1250
1300
1350
1400
1450
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
H
s
/W
s
( mm)
25
50
75
100
125
150
175
200
225
250
275
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
1250
1300
1350
1400
1450
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
25
50
75
100
125
150
175
200
225
250
275
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
1250
1300
1350
1400
1450
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
H
b
/W
b
( mm)
25
50
75
100
125
150
175
200
225
250
275
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
1250
1300
1350
1400
1450
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
25
50
75
100
125
150
175
200
225
250
275
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
1250
1300
1350
1400
1450
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
Fluid Temperature ( °C)
Acoustic Insulation
None
6 mm
10 mm
20 mm
25 mm