Odor control without ventilation

Is there a way to control odor without ventilation? If i grow, i will need to grow in a portable closet, and won't be able to keep it open for everyone to see.

I plan on using fans on the inside to at least create some circulation.

What are some ways to control odor without having a constant fresh air supply.

just have Ur inside fan blowing the air out form somewhere and put some ONa block gel around the exit area... possibly under the door or something..

do i leave the block gel in the container and just leave it open? Or is it something i have to like paint on