Forcefield-Nested Isolation Doors are a security door system developed originally by Motoyoshi Fleet Yards for the Ascendancy-class Flagship in YE 30. They since have been produced by Ketsurui Fleet Yards and the Yugumo Corporation. The technology is reliable, so they continue to be produced and used in YE 42.

The original design was based on the Himiko-class Light Escort's Atmospheric Field System. On the Ascendancy-class Flagship they were these solid Yamataium doors interlock to form airlock quality seals. Forcefield generators are located in the frame on each side of the door emitting barriers that maintain the ship's pressure and atmosphere, in the manner of the field generators typically used for KFY rapid-launch bays. The graviton fields projected also serve as obstacles for intruders and can withstand the punishment of explosions and other attacks. In the event of power failure, these fields are maintained by six-hour batteries.

Due to the original design including Yamataium they are restricted for use on Star Army of Yamatai ships only. However, In YE 42, the Yugumo Corporation started to produce the product using Durandium Alloy.

• Page was made before OOC Information Section was required.
• Page was fixed for presentation and structure by Andrew on 01/31/2020.