Control rooms, electrical control booths and other such situations may need a dedicated clean air delivery system especially if the location has inherently poor air quality. For example it will be impractical to open a window for ventilation in a control room within a deep mine, in a dusty quarry or within a steelworks. In these circumstances the space to be provided with ventilation air will need a fan blown supply of filtered air. It is likely that the background level of dust in the intake will be too high for normal disposable air filters to be an economic choice owing to the frequency with which the disposable filters need to be changed – incurring labor costs, new filters and regular disposal. The OptiFlo RC is a better solution. The air being treated will be cleaned to a very high level of cleanliness and long cartridge life can be expected. Cooling/heating of the clean air delivery may be added where appropriate.