4*8 indoor tent?? 4" or 6" fan and filter??

i run a 6" inline for my 4x8 room. it cools 2 lights just fine, its the perfect amount of airflow.
 
I have a 8 inch for 2 hoods and exhausting the room and a 6 inch for intake although a 4 inch would have been better your exhaust should be bigger than intake,my room 5x9, i would go with 4x8 heres my set up

remember that you lose cfm on your fan rule of thumb anything you connect it too will lose about 150-200 cfm example
8 inch inline 745 cfm
8 inch inline cfm connected to 2 hoods and carbon filter about 400 cfm

dont get a fan controller i would get a thermostat controller instead
 

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