ventalation

[puffinstuff64]

can any tell me how carbon filters work, i have a new set up and totaly new to indoor growing,if you have carbon filter fans, do you need to bring in ventalation form outside as well? please help.

[liquid swords]

I'm no expert, but from what I've gathered carbon filters are basically just fans with a filter of carbon in the airflow. Theoretically, you could have a carbon filter completely enclosed in your grow room and it'd still be effective, albeit not as effective as having the air flow out of the room.