Duct fitting pressure drop coefficients for
smooth converging bell mouth with end wall

From ASHRAE (1989), with permission

A5-6a.gif (8966 bytes)

r/D

C0

0

0.50

0.01

0.44

0.02

0.37

0.03

0.31

0.04

0.26

0.05

0.22

0.06

0.20

0.08

0.15

0.10

0.12

0.12

0.09

0.16

0.06

>0.20

0.03