extraction fan

hi there is 66 square meters of air per hour extractor fan enough for a 5x6x6 grow room
cheers

wait for me!!
I'm taking off my shoes so I can do the math

Depends on your goal. Heat extraction or fresh air ventilation?

For heat extraction you want 2-3x CFM than your room size. 240CFM fan for an 80CF room.

For fresh air you can go much lower.. like 40CFM for the same room. Just change the air every few minutes.