How much CFM Ventilation required?

[GeezerBudd]

I don't know, NYC.
I'm not sure if I want another hole up top-maybe just a bigger one-I will think about that-Thanks!


Gb

 

[Shockeclipse]

I hav a 145 cubic foot grow room, but I pulled air through a scrubber and through my 1k watt HPS so I went with a 178cfm and a passive intake. It created a kind of vacuum so no smell ever gets out but I am movin a lot of air around in there.