ok this is done using several things but mostly it is a negitive pressure in your grow area
1 u need a active carbon filter
1a the size of the filter depends on the size of the fan and area
1b buying a over sized filter and using a under rated CFM does not prolong the life of filter it shortens it ......the air will always travel path of least energy (meaning it will just keep sucking over the same active carbon all the time ) ...make sure the speed and filter match to get full 12 month life from it
i like this filter as it is refillable .....making the cost of it less each year u use it
https://www.ebay.com/usr/foothill-carbon-filters?_trksid=p2047675.l2559
u only need something rated in 90 120 cfm range in a 3x3x6 that would be cycling the air every min to 45 secs
2 u need a ozone gen for your house .......this is only used when u open the area up to work when u are done u turn it on for 20 mins it kills the smell in the house ...no one can tell shit
https://www.ebay.com/p/Ionic-Air-Purifier-Ozone-Ionizer-Cleaner-Fresh-Clean-Living-Home-Office-US-Z8q3/26003879493?iid=142417289270&_trkparms=aid=555018&algo=PL.SIM&ao=2&asc=47507&meid=e780f0817ea54e0292efbd263e7d87e0&pid=100005&rk=2&rkt=6&sd=172821896638&_trksid=p2047675.c100005.m1851
this is the cheap model ........they got a better one for 230 but fuck it .......this will make ozone it will attach to any smell and kill it....great for a guy house or a smokers/growers
that is it i had a state trooper 30 ft from my back door ......grow for 5 years with no trouble