extractor fan for both by Veg area and flower area?

Hi
Just wondering do i need an extractor fan for my veg area. I have built one into my flower area, however I wasn't to sure if i needed one for my veg area. Or do i just need an outlet at the top of my veg area without an extractor fan?

Thanks

What's different between veg/flower besides the hormones inside the girls? Yes, you do.

Ya, you do.