In order to retain equal sightlines or occasionally to reduce the costs of an opening window, it is possible to make dummy sashes.
These are real sashes made in the same fashion as sliding ones; only the window furniture, hardware, and balances are removed. Not all windows need to open. Providing you have sufficient opening area for the floor area of the room (normally 1/20 is recommended) there is no limit to the number of sashes required to open.
Obviously we recommend the top and bottom sashes open on the same window so that you benefit from the rapid purge ventilation when it’s needed, but providing you are happy with the ventilation of the room, we will manufacture as requested.