Venting questions

Ok so i plan on using 2 blue and 2 red all the way through and with all 4 bulbs running i have to tackle venting the tent. Does anyone think i could get away with passive intake on the bottom and a single fan pulling out? Im looking for a cost effective solution. I will also eventually need a carbon filter and was planning on doing it myself. I still have to hang the lights on chains.

My lighting is a T5 4 tube 2 foot setup. I currently have

2 - Hydro Farm F24T5 24W HO 6400k for Veg
2 - Plantmax FL24/T5/830/HO 120V 50Hz T01 for Flower

one fan will work. at the most, you need like 120 cfm

I started my journal over at https://www.rollitup.org/grow-journals/153633-strawberry-cough-blue-cheese-t5.html. I will hopefully be getting the fan today at a local hydro shop. I couldnt find sqwat at walmart and homedepot.

For that size of a light you will not need a whole lot of ventilation I would want a fan that would completely clear out the room every 5-10 minutes. The bigger the fan, the fresher the air, the cooler the temps. Some may call it overkill, but I would keep a fan in by the plants too, the more air movement the better. GL
SP