These products are used as radiators in the refrigerator to help
the inside compressor getting rid of heat.

According to the different voltage (110V/220V), this series can be
classified as follows:
1) Voltage 220V-240V: YZF5-13, YZF10-20, YZF16-25, YZF18-30,
YZF25-40, YZF34-45
2) Voltage 110V-120V: YZF6-13, YZF12-20, YZF18-25, YZF20-30,
YZF25-40, YZF34-45

Most of these products are with CE approval in Europe, VDE
approval in Germany, UL approval in America, and CCC
certificate in China.