In our project, each janitor closet (only for the storage of cleaning equipment and common deterdent) is placed inside a restroom, occupying a toilet cubicle. As a result, janitor closets are not completely sealed, but we regard the whole restroom as a sealed space. The exhaust system of the restroom complies with the LEED requirement, and janitor closet shares the same exhaust system. We are wondering if this kind of situation can meet the requirement of IEQc5.