Series or parallel in line fans?

Toke+Choke

Well-Known Member
hi setting up a new grow and I'm wondering about my in line fan setup I've got 2x 250CM/H fans
I want savage airflow do I place them
In series or parallel to achieve this?
Going to have some ducting without a fan on for my intake but my outtake will be running up a 6m long drainpipe that goes over the top of my house ;)
Obviously going to carbon filter it but I need to know what cfm rating to get for the setup of the fans.
Thanks again folks.
 
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