On Sunday, 10 May 2015 14:37:09 UTC+1, Roger Mills wrote:
On 10/05/2015 11:52, nt wrote:

Normally they go in the inner leaf for fire safety reasons

Do they?! How does that help fire safety?

Flames licking up the outside take longer to ignite the frame, retarding fire spread. Inner leaf windows have been standard for this reason for a very long time. Outer leaf windows tend to be found on very old houses that predate this.


NT