Why is this door not recommended for internal use?

[Bill]

http://www.jewson.co.uk/windows-doors-joinery/door...

Anyone?

[Bill]

m4ckg said:

It's probably due to the thickness being 44mm instead of the standard 34

That makes sense, thanks.

Utilitarian is good, it's an old farmhouse and most of the other doors are ledged and braced.

[Bill]

Although other places sell 44mm thick doors as internal.