A system to provide an extensible type repository environment can include one or more type repositories, each of which is capable of representing a type system and maintaining one or more type definitions, each representing a type in the type system. A synchronization error condition is detected when the receiving agent either: is configured to receive the data parity and actually receives the header parity, or is configured to receive the header parity and actually receives the data parity. The exhaust fan can be constructed such that air traveling along an exhaust path through the fan is prevented from contacting components of the fan that can be damaged by exposure to the airborne materials. Material confined within the reservoir is maintained under pressure, to expel any gases introduced to the interior of the reservoir as part of a mixed phase inlet stream.