On 20 Feb, 19:26, Nightjar wrote:
On 20/02/2013 18:54, Dave West wrote:

Someone with a basement flat with old wooden frame vertical sliding sash
windows wants some simple to fit security device to enable the window to be
left open safely a couple of inches whilst no one is in the flat.

Grateful for an suggestions on a simple to fit device.

Wooden blocks screwed to the inside of the sides of upper sash, unless
you want to be able to open it wider at other times.

A trickle vent through the sash or a glass vent would allow ventilation
without opening the window, but would be more difficult to fit.

Colin Bignell

if original they are usually draughty enough ;)

Jim K