Patent ID: 7500369

Claim:
A combination refrigerator/freezer unit, said unit comprising: A) a refrigerator portion; B) a freezer portion; and C) a valve in between said refrigerator portion and said freezer portion, said valve comprising: a housing portion defining an air passageway hole having an air passageway hole axis extending through said air passageway hole, and further defining a land area, said land area defining a peripheral surface portion extending substantially about the periphery of said hole, said peripheral surface portion facing inwardly towards said air passageway hole axis, said housing portion defining a tapering portion adjacent at least a portion of said land area peripheral surface portion such that air flow is more constricted when passing said land area; a gate pivotable about an axis substantially perpendicular to said air passageway hole axis, said gate capable of: substantially closing said air passageway hole, and knocking off ice formed on at least part of said land area.