Guys n girs please help me set up ventilation in the cabinet i just buit from scratch

So i just built this cabinet because i couldn't find 1 online with the dimentions i wanted, and ive been trying to figure up how to set up my ventilation.


My first idea was to cut a 6 inch hole in the right side of the cabinet and run the ducting through it to the exhaust fan that pumped it into a carbon filter.... So in other words.... cooltubetube>>ducting>>>>>>>fan>>filter

Then i bumped into...

https://www.texashydroponics.com/shop/product.php?productid=3139&cat=222&page=1

and

https://www.rollitup.org/do-yourself/58871-2-minute-cheap-easy-carbon.html

SO.... should I attach THAT to he empty side of my cooltube instead and have the fan pull the air filter>cooltube>>>>>ducting>fan??

Having said that...I was thinking of having a passive intake.
My plan was to drill a 3 inch or so diameter hole in the left side of the cabinet somewhere close to the bottom and have an L shaped PVC pipe.


400 w hps cooltube, 480 cfm inline fan with speed contoller,hydrofarm ducting
the dimentions are 20 inches deep 41 inches wide and 40 inches tall

Please help!! any input is much appreciated




yes i know i misspelled the title lol...no room for more letters

i hope its cold where you live cause that box looks like its going to get hot in there........make sure you exhaust that hot air outside the room that the box is in.....If you just exhaust the air back into the same room the box is in then you will not be exhausting anything you will just be recycling the same old Co2 depleted hot air........