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The premium construction of the L Series Doors combines the strength and dimensional stability of steel with the structural integrity of a honeycomb core. The continuous bonding of the core to the steel face sheets results in an attractive, structural, flat door that is free of weld marks. Tests have proven that the L Series Door has a high resistance to impact damage, low thermal conductivity and high STC ratings. To meet a customer’s specific application, specification and performance requirements, the L Series door offers a wide range of specifiable options including sizes, glass light designs and hardware (mechanical, pneumatic, electrical) preparations. The LCA in which this EPD was created from presents results for a typical L series door without glass light design and hardware, although a sensitivity analysis did consider what the impact of these options would be. The core for the door in this study is honeycomb cardboard. This is the standard core for L Series doors. Other core options include polystyrene and polyurethane.