Features and benefits
• Low cost ventilation
• Internal or external fixing
• Counter balanced sliding panel
• Lockable and non-lockable
• Low maintenance requirement

Typical applications
• Commuter stock
• Metro
• Light rail vehicle
• Underground
• Surface stock
• Regional railways

Finishes
• Mill
• Natural anodised
• Polyester powder coating
• Other finishes available on request

Glass types
• Single/double glazed units
• Toughened/laminated
• Clear
• Surface coated or body tinted

Features
To provide controlled ventilation under normal operating conditions or for emergency ventilation in the event of other systems failing.

The windows can be mounted to the carriage bodyside either via an external or internal flange or as a cassette if a flush/ribbon glazing effect is required.

The purpose of a balanced window is to provide the passenger with a mechanical assistance thus making the physical act of opening and closing the sliding pane relatively effortless. Hence large windows can be openable as well as those with additional weight in the form of a double glazed unit.

The balance is often in the form of a concealed spring either at the head of the window or within the crossrail aluminium profiles. Such springs are adjustable to provide longevity of life through a very simple maintenance regime.

Glass retention is achieved in many ways with the most popular being rubber wedge positioned either on the interior or exterior of the window. Using non-specialist tools the wedge can be removed and replaced thus allowing glass replacement in around 30 minutes. Alternatively the glass unit can be bonded to the aluminium framework if a completely flush/ribbon glazing effect is required.

PLP also manufacture internal aluminium trim frames to accompany the balanced half drop window which creates a perfectly matching finish to the eye of the passenger.

Both the window and the internal trim frame can be designed to have square and radius corners or a mixture of both if desired.