The trend away from open plan offices has created a demand for fully glazed partitioning. The addition of a venetian or vertical blind between the panes of the double glazed frames offers both privacy and the open plan effect.

Blinds fitted between double glazing are more effective in reducing solar heat gain than blinds mounted internally. Controls are traced through the frame of the glazing and are normally a combined mono type control utilising a gearbox for both raise and tilt functions. Operation is by means of a cranked rod or ball chain. It is advisable to consider access for the control mechanisms at the design stage and ideally the window frames should be pre-drilled before installation. Fully sealed double glazed units may use magnets or low voltage integral motors for control.

Operation

• Tilt control - a flexible bowden cable with PVC sleeving from the headrail through the frame to an aluminium or plastic tilt knob.
• Gearbox control - direct mono control from a gearbox in the headrail through the frame to an operating knob or ball chain drive.
• Electric operation - usually only tilt/rotation with a low voltage motor.
• Dual control - cord lift traced through frame within a spring and tied off to a cleat, tilt control with bowden cable and PVC-coated steel twist rod. Not suitable for sealed units

Components - see venetian and vertical blinds

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