It is important that our fans can endure the rough conditions of outdoor weathering and rain. Our fans have sealed motors and now free covers to protect the operation of the units.  However in salt water air it is much more harsh on the life span of the finishes.  One item we recommend to apply yearly is this spray to drastically reduce weathering and rust is 303 Marine Long Lasting Corrosion Coat - Dry, Clear Formula - Stops And Prevents Corrosion On Contact - Electronic Safe Water And Salt Resistant.  This product is sold on Amazon