Facilities must be provided for operators and all visitors to change their clothes and footwear. Storage will be needed for outdoor clothing and a system provided to assist correct entry to the manufacturing areas.

In some cases, change rooms are designed in such a way that a climb over bench is used to separate areas (before changing clothes, and after).

Some companies have air locks, and some companies are now designing the entry to manufacturing areas as a one-way system with double-sided lockers. This means that all personnel entering a manufacturing area must pass through the change procedure in one direction. People exit the factory and gain access to their outdoor clothes from the other side of the locker. This prevents any possibility of cross-contamination.

Some companies also have air showers where operators go through to remove any dust on their garments.