Hollow doors

[Bushwhacker]

In murder and mystery English novels, what are the hollow doors, please?

 

[tedtmc]

In murder and mystery English novels, what are the hollow doors, please?

I don't know how 'hollow doors' have to do with murder and mystery novels. It's probably the sound which is louder when knocked on.
Hollow doors are constructed of a timber frame covered with thin layers of plywood on both sides, which is cheaper. Whereas solid doors or solid-core doors are made of solid pieces of wood joined together to form a solid panel.

 

[Tdol]

They can be kicked open more conveniently when someone's been killed in a locked room. It's also easier to listen to people though a hollow door. ;-)

 

[BobK]

Also, hollows doors might figure in murder mysteries if the murder involves a fire. Many hollow doors have fire-proofing material inside.

b