Newbie Help Ventilation

Hello All! I am new... The search function works poorly or I am an idiot! Could someone help me with ventilating my 2 foot by 4 foot by 8 foot cab? Ultra quiet, and no smell please! 4 inch fan and filter probably, but do you run it all the time? I doubt that, so how do you wire it up? on a thermostat or a timer?

I know this has been cover'd... maybe someone can direct me to the threads..


Peace....
 
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