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Step 4: Make the Plenum

Picture of Make the Plenum
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The plenum is the airflow straightener it makes sure that the wind is flowing evenly through the tunnel.

- Cut your cardboard tubes to 12 inch lengths (you will need about 18).

- Experiment with inserting them into the end of your tunnel to see how they fit best.

- Once you have found the best way to put them in, take them out and hot glue them together.

- Insert the plenum into the end of the tunnel that will be attached to the fan. If it is loose, secure it with duct tape or hot glue.