Blower purge desiccant air dryers are a type of desiccant-based dryer. As desiccants become saturated with the moisture removed from compressed air, it is important to purge that moisture to regenerate the desiccant and preserve its ability to dry. Using heat or blowing compressed air through the desiccant are common ways to purge moisture. Blower purge dryers rely on a combination of ambient air, heat, and compressed air to purge moisture from desiccants. During regeneration, ambient air is heated and moved through the saturated desiccant forcing the moisture out. The compressed air is then used to cool the heated desiccant increasing its adsorptive capacity.