Why must the blinds be supplied with their glass?

The manufacturing process of a standard double glazed unit without blinds is carried out under controlled conditions. This is necessary for the double glazed units to be 100% hermetically sealed, to provide the U Values to windows and of course be reliable for many years to come.

The manufacturing process for BetweenGlassBlinds is virtually identical, which is why they must be fitted by the same company that makes the double glazed units.