Quote Originally Posted by khyberkitsune
Here's how I'd run the ducting. Picture attached
Open the passive intake on the opposite side from the filter for increase air circulation. A minor quibble to be sure...

Intake should be 1.5x the exhaust duct size. So a 4" duct wants a 6" passive vent. Two intakes will work. You may need to partially close one. Get yourself a fan speed controller so you can dial in the right speed.