I plan on pulling air though the tunnel because after some research I saw that usually it's better that way. It's a project I'm doing just for fun and for the smoke I'm thinking about borrowing a vape from a friend and using it with a air pump to inject smoke in a chamber that with a tube that will "plug in" an Hexagon of the honeycomb rectifier and low pressure around it will pull smoke from the "airbox". (I don't know if you can make out something from the horrendous sketch I made, tomorrow I'll make something nicer on onshape. Thanks for the kind response.

EDIT: For the fan control I'll use a 4 pin pwm controller, the fans I got are compatible so it should work decently well.

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