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This product is discontinued and no longer available. For maintenance information or further details, please
Architonic ID: 1065738
SKU: 421 943 00 12
Year of Launch: 2008
Precisely refined to suit the requirements of AC 4, the FlowMotion mechanism facilitates a dynamic range of movement and provides weight-adapted support in every sitting position – even when the seat is tilted forward. And thanks to the inclusion of distinct comfort zones in its quilted structure, the backrest provides optimal support for each section of the human spine:
1. Lumbar zone: integrated in the backrest, the lumbar zone provides comfortable and effective support for the lower back. The optional height-adjustable lumbar pad transitions smoothly into the flexible middle zone.
2. Sink-in zone: this flexible zone reduces back tension, removes pressure from the spinal discs and straightens the shoulders and head.
3. Shoulder zone: the support in the shoulder zone relaxes the neck muscles and enables the sitter to effortlessly maintain a horizontal viewing angle for computer work.
The version with aluminium ring armrests is an elegant option for conference settings, especially in combination with leather upholstery.
The timeless appearance of AC 4 is just one aspect of its ecologically sustainable design. It bears the ‚Blue Angel‘ seal for low-emission upholstered furniture and GREENGUARD certification for indoor air quality.
Materials
Office swivel chair with 3D armrests according to EN 1335, Ergonomic Seal of Approval.
Mechanical unit: FlowMotion mechanism with synchronised forward tilt (can be disengaged) and with seat depth adjustment. Mechanical unit powder-coated in basic dark.
Backrest and seat: self-supporting backrest structure with horizontally stitched padding. Backrest mount in polished die-cast alumini- um. Optional height-adjustable lumbar support pad. Seat cushion in polyurethane foam. Cover in Plano or Twill fabric or in leather.
Armrests: optionally with fixed, polished die-cast aluminium ring armrests for conference areas (optional leather covers matched to the leather upholstery; for chairs with fabric covers, the leather armrest covers are in the colour nero) or with 3D armrests with polyurethane pads in basic dark.
Base: five-star polyamide base in basic dark or polished die-cast aluminium base with double castors (Ø 60 mm) in basic dark.
585 x 530-780 x 1010-1130 mm
This product belongs to collection:
Aluminium, Base metal, Leather, Metal, Seat leather

Italy
Antonio Citterio was born in Meda in 1950. He graduated in architecture from Milan Polytechnic and opened his studio in 1972 where he started his architectural and interior design business. Between 1987 and 1996 he worked in association with Terry Dwan and, together, they created buildings in Europe and Japan. Among his most significant works: the restyling of a block in the historical centre of Seregno, Esprit headquarters in Amsterdam, Antwerp and Milan, industrial plants for Vitra, in Germany, and for Antonio Fusco, in Milan. In 1999 “Antonio Citterio and Partners” was founded by Citterio and Patricia Viel, a multidisciplinary practice for architectural design, industrial design and graphics. Patricia Viel was born in Milano in 1962. She graduated in architecture from Milan Polytechnic in 1987 and she started her collaboration with Antonio Citterio in 1986. From 2005 she is member of the National Institute of Architecture IN/ARCH. The firm develops projects for residential complexes, apartment buildings, hotels, trade centres, industrial sites, restructuring of public buildings, planning of workspace, offices and showrooms; it is also operational in the field of corporate communication - implementing corporate image projects, fittings, graphics. From January 2007 the firm is UNI EN ISO 9001:2000 certified. In the field of industrial design Antonio Citterio works for Italian and foreign companies such as Ansorg, Arclinea, Axor-Hansgrohe, Aubrilam, B&B Italia, Flexform, Flos, Fusital, Guzzini, Iittala, Inda, Kartell, Maxalto, Sanitec Group - Pozzi Ginori, Simon Urmet, Technogym, Tre Più, Vitra. In 2000 the new headquarters opened in Milan, Via Cerva 4, and in May of that same year new offices were opened in Hamburg, 75b Wrangelstrasse. In 2002 the construction of the building where the headquarters of the Edel Company are located, along the Elba river, was completed as well as an office building in Neuerwall, two constructions for offices and textile manufacturing in Legnano and Lecco and the headquarters of the CR&S Centre completed with showroom and offices for B&B Italia in Novedrate. Between 2003 and 2004, a corporate image project was implemented for De Beers (London and Tokyo) and, in May 2004, the Bulgari Hotel was inaugurated in Milan, the first of a chain of luxury hotels known as “Bulgari Hotels and Resorts”. In 2005 the restructuring of the historical Town Hall of Clusone, the project for the headquarters and nursery of the drug company GlaxoSmithKline in Verona, the project for a law firm in Sondrio, Italy were completed; added to this two projects for private house, one in Basel, Switzerland, the other in Sardinia, Italy and the jewellery De Beers in Los Angeles. In September 2006 has been inaugurated the Bulgari Resort in Bali, the Aspesi showroom in Milan and the pedestrian square “Michele Alboreto” in Rozzano. In 2007 the Bulgari restaurant and cafè opened in Tokyo, Ginza district. In January 2008 was completed the building for the New Ermenegildo Zegna Headquarters. The project for the new “Technogym Village” in Cesena (production site, offices and trade centre), a new square in Busto Arsizio; the functional restructuring, furniture and security of the Southern Pier in Marina di Ravenna, the renovation of the urban ex-Martinelli area in Morbegno, all in Italy, master planning and private houses are underway. Antonio Citterio and Partners took part in a great number of international competitions. In 2004: project in cooperation with other architects to change the historical centre of Fiera Milano into a new urban centre; project for the building of the “Brooktorhafen” bridge in the new “Hafencity” district in Hamburg; project to enlarge a new multifunctional school building and a kindergarten for the Deutsche School in Milan. In the same year, together with other architects, he won the competition for the functional arrangement, street furniture and security systems of Molo Guardiano sud / Marina di Ravenna, which was presented on the occasion of the 9th International Exhibition of Architecture of the Biennale of Venice, section “Towns on Water”. In the year 2004, publishing company Electa launched the monography “Antonio Citterio Industrial design”. In 2005, Antonio Citterio and Partners won the competition for the project of an hotel in the Hafencity district in Hamburg and received the 2nd prize at the international design competition for the hotel facilities in the new exhibition grounds of Rho-Pero. In the same year the Neumühlen project receives the 2nd prize from the Hamburg Architektur Preis and a special mention from the Deutscher Architektur Preis. Still in 2005, written by Luigi Prestinenza Pugliesi and published by Edilstampa, the monography “Antonio Citterio” has been issued. In the same year, he received 2nd prize at the design competition for Parco Levante Cesenatico and wins the international architectural competition for the renovation of the Ferrante Aporti building (former Italian post office) in Milan. In 2007: the Mies van der Rohe Award jury selects the project for the GlaxoSmithKline day nursery in Verona; the Italian publishing house Skira issued the monograph “Antonio Citterio. Architettura e Design”; 2nd prize at the international design competition for the Diocesano Museum in Milan. From 2006, Antonio Citterio is professor at the Accademia di Architettura dell’Università della Svizzera Italiana and from 2007 he is member of the Italian Design Council. In 2007 he received the “Royal Designer for Industry” award from the “Royal Society for the encouragement of Arts, Manufactures & Commerce” in London.