Device was returned for evaluation, during testing, the uut did not exhibit any signs of smoke or dust internal or external to the unit.Internally, there were no signs of smoke or burns from on the circuit board, capacitor, compressor, or fan.However, the uut did have a defective fan, which affected the cooling in the unit, allowing the unit to overheat and compressor to shut down.When the compressor overheated and shut down, there was no smoke produced.A known properly functioning cooling fan was connected to the circuit board of the unit and rotated properly without issue.This shows that the cooling fan and not the circuit board in the uut was defective, which prevented proper cooling in the unit.The oxygen produced by the uut was within specification at every flow rate.
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