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:

az_mani = 0
a_cone = 100
a_mani = 30
d_fan2 = 70
d_fan1 = 40
n_pipe = 1
ds_fan2 = 3.2
ds_fan1 = 3
l_mani1 = 0
n_angle = 0.501
ls_fan2 = 62
ls_fan1 = 32
$fn = 90
t_wall = 2.5