Citaros with warm air curtains

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infra fürth verkehr gmbh has seven Mercedes-Benz Citaro LEs fitted with the cutting-edge technology. DAIMLER
infra fürth verkehr gmbh has seven Mercedes-Benz Citaro LEs fitted with the cutting-edge technology. DAIMLER

GERMANY While over-door air curtains are a very familiar feature on buildings in temperate central Europe, they remain an exception for buses. When they are fitted, over-door air curtains, also known as air showers, are almost exclusively used in hot or tropical climates. However, the Franconian transport operator, infra fürth verkehr gmbh of Fürth has just had seven Mercedes-Benz Citaro LEs fitted with the cutting-edge technology.

Over-door air curtain technology was originally developed for use in warm countries. Special fan units are fitted above the doors to direct the air vertically downwards at high speed. This creates an air curtain which acts as a “climate separator,” preventing an exchange of heat between the interior and exterior air. This works both on hot days when cold, air-conditioned air is prevented from escaping through the open doors and on cold days when warm air is prevented from escaping.

In more temperate climates door air curtains are just as useful as they are in tropical countries – or perhaps even more so, as they bring with them two additional safety-relevant advantages. In the winter months, the air blown downwards is warm, which means that the floor area around the doors dries more quickly, enhancing passive safety in snowy and icy conditions. The system has an additional benefit. In practically any external temperature, the warm air prevents condensation from forming on the glass surfaces of the doors. Minimising misting of the windows is a significant safety factor, particularly for the forward doors where all-round visibility is enhanced.

For some years now infra fürth verkehr gmbh has been operating low-entry model variants of the modular Citaro. Two of the seven Citaro LEs being supplied are rural-service Citaro LE Üs. These vehicles will be used for, among other things, an airport service and their distinctive design reflects this. The sides of the brilliant silver and black buses feature a distinctive silhouette of a plane. The rear decal in a yellow/black chequered design echoes the “Follow Me” vehicles used at airports.

infra fürth verkehr gmbh has overall responsibility for the local public transport system in the city of Fürth, with eight bus services and one underground service covering a network of around 152 kilometres. In 2014 the transport operator transported over 24 million passengers. infra fürth verkehr gmbh’s current fleet of 50 vehicles includes 47 Mercedes-Benz Citaro buses.