The standard double glazing unit is 22mm (4/14/4) featuring 'Low E' glass and using a drained and vented system to ensure excellent thermal and sound insulation.

Specialist units, for additional insulation and security, and a range of glazing bars and astragals are also available on request.

Timber beads are used all round to further enhance the traditional appearance. The beading is fixed using Allan Brothers' fixing system to enhance product integrity and appearance.

In addition, security glazing tapes can, if required, be fitted to the internal upstands making it virtually impossible to remove the glazing units from the outside.