Alcoa Inc.

Kenneth B Balazic

Russell S Long

Andrew B Trageser

Miloslav Novak

Eric F M Winter

Jerri F McMichael

A two layer door is provided. The first layer is made of a plurality of metallic members with a portion of the metallic members having one or more channels adapted to receive one or more armor panels. The second layer is made of the channels of the metallic members and armor panels disposed within the channels. The door also has one or more pivotally attached panels to the door that are adapted to open at a preselected pressure differential across the door. The door is also available as a kit.

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Bethel Park, PA, United States of America

Kenneth B Balazic