Basements & Lift Doors

Hi there,

I have 2 short questions related to FRA's:

1. With the Home Office guides suggesting 60 min fire separation between basement and GF, I just wondered what the rationale was behind this requirement?

2. Where elevator doors open onto a protected escape route - how can you tell that the doors are fire rated? Similarly, would you expect kitchen dumb-waiters that pass between levels to typically have fire-rated doors?

Thanks