Increasing laser airflow

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Laser cutting items generates quite a lot of smoke. There is a great big fan on the back of the laser to suck this out of the casing but it's not the most effective thing in the world. Now that I'm in the garage with the door closed I'm noticing it more too. 
There are no obvious entry points for air to get into the machine so my idea is to lift the lid slightly (not too high because of the magnetic safety lock) and then pump some air in from the front. I'm hoping this will create airflow across the work piece and straight out the back. So I started with these lid stand off's they lift the lid just a little and allow easy air entry.
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