CMcF, what are the reliability requirements, resistant to salt spray does not fully describe, does the housing need to be waterproof? If longevity is not an issue, just source a cheap PC cooling fan and place in a housing. Replace the fan as it disolves! They are relatively inexpensive.
HEC,
a very valid sugestion. However access rather than cost would be an issue.
I have since found that EBM PAPST will supply "Encased Fans". These have had their windings and PCB potted, the cable entry sealed and have stainless steel bearings.
