The AstroFan unit features a high-performance, encapsulated, direct-driven backward-curved fan/motor combination and a replaceable HEPA or ULPA AstroCel II filter. It comes in two housing options: mild galvanized steel for standard applications and aluminum for larger and EC models. Additionally, an epoxy-coated white RAL 9010 housing is available for sterile environments, as it can be decontaminated with disinfectant.