Inline fan/carbon filter set-up

Hey all i recently bought a 4" inline fan/elf filter combo. I am new to this so i am kind of confused on how to set this up. Anyone have any good pictures of any good setups?? Should i be sucking air from the room and it being exhausted into the carbon filter?? OR Do I suck from the carbon filter and exhaust the air somewhere else?? Any ideas or input would be great
Thanks

anyone?? anyone??