dont bring them in , filters on your intake fans a sealed room and the biggest problem is they will hitch a ride into your room with you . You could go insainly overboard and suit up like going into a clean room every time . Or what i like is a place a secondary plant into my room with my girls and when i release the red army of death {mite preditors } I make sure the secondary plant is covered too . This way the red army has its own base and they wont be taken out when you harvest your girls. But mites are a bitch if you dont have a control for them eaither by spraying them{ never use the same type of spray crontol to many times} mites have a quick turn around time from egg to adult so they have a tendency to build up immunitys. I love bio controls . you can also go to any strawberry patch farm and talk to them as the are always combating spider mites .