Overlapping doors are used as fire doors. The problem is that they can be closed incorrectly.
![](https://mistakeproofing.com/wp-content/uploads/2024/03/image-12.png)
This lovely mistake-proofing device from Wales solved the problem…
![](https://mistakeproofing.com/wp-content/uploads/2024/03/image-11.png)
By propping the outer door open enough to allow the inner door to swing past before closing completely. You cannot close the door wrong.
![](https://mistakeproofing.com/wp-content/uploads/2024/03/image-13.png)
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