While the Model FM and Model RM Series3 Germicidal Systems are designed for the optimum level of protection against airborne germs, infectious agents, gases and odors, the ERUV14-24V unit can be utilized as a supplement for direct surface kill of biological growth within your HVAC system. This system is especially effective when used in conjunction with a Model FM or Model RM UV system in southern markets with high levels of humidity and where biological growth is more prevalent and difficult to control. Installing a ERUV14-24V alone, without any other air cleaner or UV system, is the minimum you should do and can be the first step in a whole house indoor air cleaning strategy.