I'm wondering because my plants are about halfway through flowering and my carbon filter seems to be ineffective at this point to cover the smell.. I plan to purchase one of those ONA gel things, perhaps an HEPA air purifier / ozone generator, and I'll redo my homemade carbon filter, but in the meanwhile I was wondering if my neighbors would be able to smell it It doesn't stink up my whole house but the room where my cabinet is definitely reeks of pot (And I'm only growing 3 plants..) Any comments would be appreciated!
Get a mountain air filter, make sure you have negative pressure in your grow area. A good filter is really the only option. Odds are if there is drywall on both sides your good.
If you can not make a good filter why don't you just buy GOOD one... Security and safety is something that you can not be cheap about....