Installing 12 volt fans

We've spent the past week doing equipment maintenance and getting our boat ready. Latest addition is a set of Hella two-speed turbo fans over the helm and nav seats. The fans can act as poor-man's air conditioners underway on hot days or can be used as defrosters on cooler mornings. Installation was straight-forward, but running 40 feet of wiring through the wire chases proved that I don't bend as easily as I once did!