how should i run my fan??

[bongzilla420]

how should i set my fan on my plant???

 

[FireWeed]

Depends on how old your plant is. If its young lots of people have a light brezze coming from their fan directly to the plant to strengthen the stem. If you just want air circulating in your grow box or grow room it can be about anywhere with it running faster(depends on temp of your grow room).