Truthfully its trial and error... this will be my first grow in my house but ive helped wire and set up and maintain a lot of grows

i find the first few times its a trade off between smell and how cool you can get it... cause its hard to push tons of hair through a fliter with computer fans lol

some fliters work really well and others only mildly... you kind of just have to go into it assuming youll change it down the road

id say they work on average about 80% of the smell... also get a strain that doesn't smell as much

but with additional 'smells' in the room its hard to tell... for example get something that sprays or really strong deorderizers and youre fine

my buddy also grows a really strong smelling flower with his weed... so when it blows out it barely smells