100 cfm bathroom fan

I got myself a 100 cfm bathroom fan for a 4x3x8 foot space and I'm going to attach a DIY Honeywell carbon air filter , is this overkill? Can a bathroom fan be run on a dimmer? I already wired it to an extension cord so it can be plugged in but If a dimmer can be added I'll splice it in, does anyone run their bathroom fans on a dimmer?
Thanks in advance.

This is the fan I bought:
http://www.homedepot.ca/webapp/wcs/stores/servlet/CatalogSearchResultView?D=945396&Ntt=945396&catalogId=10051&langId=-15&storeId=10051&Dx=mode+matchallpartial&Ntx=mode+matchall&recN=51 5&N=0&Ntk=P_PartNumber

You can never have too much airflow, you should be alright, although I usually find bathrooms fans to be loud, hows that one sound?

Bathrooms fans aren't designed to be run on a dimmer. It'll might work, but I'd advise against it.

don't use a dimmer, that sounds like it will move the right amount of air

bathroom fans vibrate and they're to loud too, should get yourself an inline fan on a thermostat.

Thanks guys, the fan isn't too loud, it's loud enough to be annoying but not enough to attract any attention and I don't spend all that much time around my grow closet anyways so it won't bother me.