Patent ID: 6941997

Claim:
A door assembly comprising a barrier door rotatable about an axis of rotation and an environmental door rotatable about the axis of rotation of the barrier door, the barrier door and the environmental door being selectively rotatable independently of one another, the barrier door and the environmental door further including an interlocking means for releasably interlocking the barrier door and the environmental door together so that the barrier door and the environmental door can be rotated in unison about the axis of rotation of the barrier door, the environmental door having a handle access hole passing therethrough and the barrier door having a handle passing through the handle access hole when the barrier door and the environmental door are latched together so that the barrier door and the environmental door can be opened in unison by the handle when the barrier door and the environmental door are latched together, wherein the environmental door further includes a cover for selectively closing the handle access hole, so that the handle access hole can be closed to provide an environmental barrier when the barrier door and the environmental door are in different rotational positions.