The RSD high temperature exhaust fan maintains the required negative pressure for all high temperature and grease duct applications. The RSD housing and impeller is constructed of 316L stainless steel, which helps prevent corrosion from the elements. The tool-less clamp and hinge provides easy access to the impeller for routine maintenance and cleaning. Using the provided UniversalSpeed Controller (USC), the RSD speed can be set based on current conditions to maintain proper draft.