Have a failing/failed cooling fan from a HP machine with OPT 003 (400 Hz), which appears to apply to the type of fan installed.
Are there any requirements (trying remember undergraduate EE class that described analysis of induction motors - does that describe a typical cooling fan of this sort? - but that is digging waaaaaaaaaaaaaaaaay back to the 70s... Should a generic 120 VAC 60 Hz fan of sufficient air flow be acceptable, or do I need search for a fan designed to support 400 Hz?)
