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An ice making appliance includes a sealed icebox compartment including a heat exchange opening with an ice maker disposed within the sealed icebox compartment. The ice maker includes a heat exchanger positioned at the heat exchange opening of the icebox compartment and a mold body configured for rec

An ice making appliance includes a sealed icebox compartment including a heat exchange opening with an ice maker disposed within the sealed icebox compartment. The ice maker includes a heat exchanger positioned at the heat exchange opening of the icebox compartment and a mold body configured for receiving liquid water and forming ice. The ice making appliance also includes a defrost conduit having a first portion positioned below the mold body, the first portion of the defrost conduit extends generally perpendicularly to a vertical direction and slopes towards a second portion of the defrost conduit, the second portion of the defrost conduit extends along the vertical direction between the first portion of the defrost conduit and a drain conduit. The ice making appliance also includes an air circulation conduit providing air circulation within the sealed icebox compartment.

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1. An ice making appliance, comprising: a sealed icebox compartment including a heat exchange opening;an ice maker disposed within the sealed icebox compartment, the ice maker comprising a heat exchanger positioned at the heat exchange opening of the sealed icebox compartment, wherein the ice maker

1. An ice making appliance, comprising: a sealed icebox compartment including a heat exchange opening;an ice maker disposed within the sealed icebox compartment, the ice maker comprising a heat exchanger positioned at the heat exchange opening of the sealed icebox compartment, wherein the ice maker further comprises a mold body configured for receiving liquid water and forming ice;an air circulation conduit providing air circulation within the sealed icebox compartment;a defrost conduit comprising a first portion positioned below the mold body, the first portion of the defrost conduit sloping towards a second portion of the defrost conduit, the second portion of the defrost conduit extending along the vertical direction between the first portion of the defrost conduit and a drain conduit; andan ice storage bin disposed within the sealed icebox compartment below the first portion of the defrost conduit, the ice storage bin defines a peripheral air flow channel extending at least partially along three sides of the ice storage bin, the air circulation conduit extending through the peripheral air flow channel of the ice storage bin, into a first interstice between the second portion of the defrost conduit and the heat exchanger, into a second interstice between the first portion of the defrost conduit and the mold body, and through a vent in the first portion of the defrost conduit. 2. The ice making appliance of claim 1, further comprising a fan disposed proximate to a lower portion of the ice storage bin, the fan configured for drawing air from the peripheral air flow channel of the ice storage bin into the first interstice. 3. The ice making appliance of claim 2, wherein the fan is disposed in a housing, the housing integrally formed with the second portion of the defrost conduit. 4. A refrigerator appliance, comprising: a cabinet defining a fresh food chamber and a freezer chamber, the freezer chamber positioned below the fresh food chamber along a vertical direction, the cabinet also defining a sealed icebox compartment outside of the freezer chamber and proximate to the fresh food chamber, the sealed icebox compartment including a heat exchange opening;an ice maker disposed within the sealed icebox compartment, the ice maker comprising a heat exchanger positioned at the heat exchange opening of the icebox compartment and a mold body configured for receiving liquid water and forming ice;a defrost conduit comprising a first portion positioned below the mold body, the first portion of the defrost conduit sloping towards a second portion of the defrost conduit, the second portion of the defrost conduit extending along a vertical direction between the first portion of the defrost conduit and a drain conduit;an air circulation conduit providing air circulation within the sealed icebox compartment; andan ice storage bin disposed within the icebox compartment below the first portion of the defrost conduit, the second portion of the defrost conduit positioned between the ice storage bin and the heat exchanger, a fluid path defined between the second portion of the defrost conduit and the heat exchanger,wherein the ice storage bin defines a peripheral air flow channel extending at least partially along three sides of the ice storage bin, the air circulation conduit extending through the air flow channel of the ice storage bin, into a first interstice between the second portion of the defrost conduit and the heat exchanger, into a second interstice between the first portion of the defrost conduit and the mold body, and through a vent in the first portion of the defrost conduit. 5. The refrigerator appliance of claim 4, wherein the heat exchanger and the drain conduit occlude air flow through the heat exchange opening. 6. The refrigerator appliance of claim 4, further comprising a harvest heater positioned near a bottom portion of the mold body, wherein the harvest heater is configured to at least partially defrost the mold body and the heat exchanger, and wherein the defrost conduit is configured to convey frost melt water generated from the mold body and the heat exchanger to the drain conduit. 7. The refrigerator appliance of claim 6, further comprising a fan disposed proximate to a lower portion of the ice storage bin, the fan configured for drawing air from the peripheral air flow channel of the ice storage bin into the first interstice. 8. The refrigerator appliance of claim 7, wherein the fan is disposed in a housing, the housing integrally formed with the second portion of the defrost conduit. 9. The refrigerator appliance of claim 6, wherein the heat exchanger comprises an outside facing away from the sealed icebox compartment and an inside extending into the sealed icebox compartment, and the drain conduit comprises a drain cup, the drain cup sealingly engaged with the second portion of the defrost conduit and the drain cup sealingly engaged with a lower portion of the heat exchanger at the outside of the heat exchanger. 10. The refrigerator appliance of claim 9, wherein the second portion of the defrost conduit is sealingly engaged with the heat exchanger at the inside of the heat exchanger. 11. The refrigerator appliance of claim 10, wherein the drain cup is sealingly engaged with the heat exchange opening and the heat exchanger is sealingly engaged with the heat exchange opening such that the drain cup and the heat exchanger occlude air flow through the heat exchange opening.