Can the unit owners use the fire escape on a daily basis though?

I know fire escape is locked from the inside, meaning that people cannot enter to any floor via fire escape and can only exit via the ground floor. However, I'm not sure if people can exit to a common area (i.e. if 10th floor is a facility floor).

If they can exit to the facility floor through fire escape, can they use it on a daily basis instead of taking the lift (i.e. for those living on the 11th floor)

Can fire escape exit via facility floor or it must be on the ground floor though 

Just wondering only... suddenly thought about such scenario in my head