N_Cook wrote:

Perhaps the sensible approach to this is extend the rubber feet by half an
inch as this is a known cure.

A simple solution at least.


There is no obvious place to put a secoind fan at the air outlet.

You CAN 'gang' 2 fans in series to increase the air pressure but I've never
needed to do it.

Also, fitting a 'thicker' fan will increase the air pressure. You may find 12,
19 and 25mm versions of certain axial fans. The thicker they get, the more
pressure they generate and that helps achieve good airflow. The CFM figures are
largely just a guidline since there are with zero pressure gradient.

Graham