when i set my filter up, i went cheap... htgsupply 6inch fan and growbright filter...it DID NOT remove 100% of smell (maybe 75%). And i am venting it back into the room the closet is in too.
As I can't get away with any smell at all... I had to do this...
1) get another filter.... have one inside the closet pulling air out, and one having that same air push through... (This gets about 90% of my smell gone)
At this point you will probably be fine, you could cover up the rest with sprays, or a dirty stinky room... or cig smoke.
I also highly recommend getting the fan speed control (the fans are LOUD, dont let people fool u. I sleep under mine... turned just into the M setting is basically silent)
2) get ONA pro gel... (I just put the stuff in the drop ceiling of my room where my air dumps.. and shake it up every week or so.)
At this point, i would say that 99% of the smell is gone. And if you dont have people snooping (unlike me) you will be good to go...
3) lastly get a small ozone gen, put it near where ur air is dumping (Im using the C.A.P. ozn jr... but it is junk and pretty much not making much ozone at this point)
If you sleep in the same room as the closet.. dont get the ozone.. (i wouldn't recommend it anyway now cause they break so fast).
But right now, with the generator only putting out very small amount of ozone, i have 100% smell control at 5weeks flowering. and im not being killed by ozone...
all in all this setup is rocking... I have people in the room and the surrounding room all the time.. and noone knows... and they all know what they would be smelling if they smelt it....
but it cost me about $300... Worth every cent in my situation.. maybe not worth it for you... but if i get caught..i get kicked out...