Inline fan placement

I redesigned my flower room a bit. Got a better ac so i dont have to vent all my co2 evry hour and half. Just wondering a good placement for my inline fan. Intake from outside to two hood to a 90 up to vent into attic. Should i place fan after intake before hoods or after hoods befor 90.
Thanks for the help +REP

I guess after hoods. After the 90 would be best if possible IMO.

I second Stonetech. Fans pull much better than push, so the farther along the line the better.

ill see if i can do after the 90 but ill have to check if no right befor the the 90 and out