Thermo Pride MODEL OPA - Manual (Page 59)

All installations and services must be performed by qualified service personnel.
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ducts for any signs of collapse, holes, or excessive corrosion. Repair or replace
components as required.
8. It is advisable to wax the outer surface of the appliance housing yearly to provide the
surface finish protection from excessive degradation by sunlight and inclement
weather. A good grade of automotive wax should be used to protect the finish.