Ah cheers man,

I was just reading about the carbon filter;
Do I push air through it (the filter is outside thr grow room having the smell pushed through it disapating into outside air)
or
Do i pull air into it (the filter is inside the grow room and the air inside [smell] is being pulled into the filter and exhusted into the air outside.

Or can it be done either way? :P

Thanks for all the help