Customized version of http://www.thingiverse.com/thing:735038

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=735038

Using the following options:

n_angle = 0.501
n_pipe = 1
l_mani1 = 5
a_mani = 0
ds_fan2 = 5
ds_fan1 = 5
t_wall = 2.5
az_mani = 0
a_cone = 100
ls_fan2 = 138
d_fan2 = 150
ls_fan1 = 110
d_fan1 = 120
$fn = 90