Extractor size

8" inline fan. I wouldn't go any smaller. Get one that is adjustable. AC infinity produces fans that will adjust based off the temperature of the canopy if you wanna look into that. BTW I had to google what a roof qube was, just call it a grow tent next time. :)
 
There are numerous grow room calculators online you can fill out and figure out what size of fan you need for your specific setup.


 
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