5inch filter

Depends on your environment, if your ambient air coming in to your grow is already close to ideal grow room temps then you need more air exchange to maintain a low rise from ambient.
I can run a 1mx1m on a 4" turned right down on a speed controller and run two 9square foot spaces with one 6" (most of the year) but we all live in different climates.
 
Hmm, I wonder if thats a vortex knockoff. Never seen them in that style box.

Got a pic of the fan itself? Especially showing the nameplate markings
 
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