I picked up a carbon canister before I started my first grow. My place is not only fairly small, but with the return vent for the HVAC in my main room, the rest of the house gets to sample any strong smells that start here.
When I got mine, it was missing the pre-filter. So I emailed the place I bought it from, and they not only sent a pre-filter, but a whole new canister, too. Still blown away by that response.
Good thing, because I am going to want a backup when Ms. GG4 starts to make her presence known.