The modern sliding sash window can now be delivered to site complete, i.e. double glazed with Low E Argon filled units, fully factory finished with the colour of your choice and with weights and lines fitted. We can, if you prefer, send the weights loose but fully marked for you to fit by taking off the back lining and attaching the weights prior to fixing the window in place. This method reduces the weight of the window by about a third to assist in handling.