Hello Amy,
The breakaway device will always remain attached to one end of the chain if it does break apart. In order for this safety device to be fitted in-line with child safety legislation, as the installation height of your window is unknown, we will calculate the chain length to be 2/3 of the blind drop. For example, a blind with a 120cm drop will have a chain no longer than 80cm.
We will not make any exceptions for customer requests for any longer chain lengths required, if you would like to query the chain length we would supply for a specific blind size or provide us with an Install Height of your window, the we will be happy to apply this specific instruction to your order – however this must be done within 1 hour of placing your order, by eMail.
Thanks
Emma