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AC 4 Task Chair

Note: This product is no longer available.

Design by Antonio Citterio, 2008. By Vitra.  With innovative technology that is neither showy nor hidden, the AC 4 Task Chair creates a balance between advanced ergonomic functionality and subtle design. Three-zone comfort includes an integrated lumbar... Read More
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Design by Antonio Citterio, 2008.
By Vitra.

With innovative technology that is neither showy nor hidden, the AC 4 Task Chair creates a balance between advanced ergonomic functionality and subtle design. Three-zone comfort includes an integrated lumbar zone, a flexible zone for the upper back that reduces tension and pressure on the discs and straightens up the neck and head, and a supportive shoulder zone which keeps the neck muscles relaxed, making it easier for the user to maintain a horizontal view of the screen.

The AC 4 Task Chair features a synchronizing mechanism, with large opening angle and automatic weight adjustment of the backrest resistance, ensuring that the user's weight is supported in every sitting position. The polished die-cast aluminum base and fixed ring armrests add an element of elegance and sophistication. Available with casters or glides.

Vitra's AC 4 Task Chair has been awarded the Blue Angel eco-label and is also GREENGUARD Certified. AC 4 is made of up to 51% recycled materials and can be re-recycled up to 94%.


Standard Delivery is Curbside. White Glove service is available at a premium and must be requested at the time of order placement. Please contact our Sales Department for rates.


Material(s): Die-cast aluminum, polyurethane foam


  • 23" W X 20.25-30.75" D X 39.25-43.5" H
  • Seat Height: 15.5-20.25"
  • Seat Depth: 15.75-18"



Antonio Citterio

Designer: Antonio Citterio

Antonio Citterio was born in Meda in 1950. He graduated in architecture from the Politecnico of Milan. Since 1972 he has worked in the field of industrial design as a designer and consultant. He works with many manufacturers such as Ansorg, Arclinea, B&B Italia, Flexform, Flos, Hackman, Inda, Kartell, Tre-P&Tre-Piu, Valli & Valli and Vitra. In 1999 he became art director for Brionvega.

In 1981 he began working on architecture and interiors, establishing a multi-disciplinary architecture and design studio with experience ranging from architecture to corporate design, comprising total creative directing for a mixed range of international clients.

Antonio Citterio received the Golden Compass Award in 1987 and 1995. He lives and works in Milan.

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Manufacturer: Vitra

Classic. Modern. Sustainable.

Vitra has manufactured furniture designs by Charles & Ray Eames and George Nelson since 1957. Building on this foundation, Vitra has developed a wide range of furnishings for the office, for the home and for public spaces in collaboration with progressive designers. Yet Vitra is more than just a design-oriented manufacturing company. The name also stands for the Vitra Design Museum, for a collection of modern furniture and its accompanying archive, for workshops and publications on topics of design, and for an architectural concept that unites buildings by Frank Gehry, Nicholas Grimshaw, Zaha Hadid, Tadao Ando, Alvaro Siza, Herzog & de Meuron and SANAA at the Vitra Headquarters in Birsfelden (Switzerland) and on the Vitra Campus in Weil am Rhein (Germany).

Product longevity is central to Vitra's contribution to sustainable development; short-lived styling is avoided at all costs. This can be seen most clearly in the classical pieces of furniture that have been used for decades, had several owners and have then even ended up as a part of a collection. For Vitra, the manufacture of sustainable products means intense pre-production development, where the highest-grade materials are selected and tests are carried out that simulate 15 years of use. In order to enforce and monitor sustainable development in all business activities of the company, a work group was formed in 1986 by the name of 'Vitra and the Environment'. Because of this, Vitra can proudly claim that it has been dedicated to sustainability for nearly a quarter of a century.

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