The types and speed of fragrance evaporation are what mainly affects the level of fragrance that can be achieved in specific environments. The systems used are normally either powered by mains or battery voltage (Smaller space fragrancing systems can work without a power source but these tend to be more along the lines of household versions).
In many restrooms the degree of finish and decoration is very high and to fit mains powered units may leave damaged walls or exposed wires. In these situations the end user may prefer a battery powered unit.
These units are very effective, well proven and fit with regular restroom maintenance plans.
These systems work by battery powered fans on timers with refills containing a fragrance medium or by timed release aerosols.
Using mains power opens up additional ways of getting fragrance into the air and will typically fragrance larger areas
Mains voltage (with or without transformers) allows for the use of air pumps and fragrance atomising systems which can put many times the amount of fragrance into the air than a conventional system. Larger refills can be used for longer service cycles and in some cases the units can contact the service providers with status reports.