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AC4 2008

 Antonio Citterio 2008

DesignReasons sells the AC4 Task Chair designed by Antonio Citterio for Vitra. When designing the AC 4, the aim was to subtly integrate the functions required to provide the best level of comfort. The reason for this is that until now, office chairs were either designed with a view to aesthetics or to functional characteristics. The AC 4, by contrast, integrates its ergonomic properties in such a subtle way that the constructional tricks are hidden away. The AC 4 creates a balance between advanced ergonomic functionality and subtle design. The innovative technology is neither showy nor hidden under foam padding. This makes the AC 4 an iconic object with an aura of elegance coupled with uncompromising functionality.

Furniture Type Office Swivel Chair complying with EN 1335/Seal of Ergonomic Approval

Synchronizing Mechanism With automatic initial setting of the backrest tension to the user's weight. Additional fine-tuning of tension possible.

Backrest and Seat Self supporting backrest structure with vertical cushion chambers sewn in place. Backrest supports in die-cast aluminium, polyurethane foam seat upholstery.

Armerest Fixed polished die-cast aluminium ring armrests for conference areas with optional leather cover (corresponds to the color of the chair's leather, with a fabric cover the padding isin leather nero) Or the 3D armrests with soft polyurethane padding in basic dark.

Base Five Star Base in two designs. Fiberglass-reinforced polyamide in basic dark or polished die-cast aluminium with double-casters 2 3/8" round in basic dark.

Optional AC4 Conference Chairs with ring armrests and four-star base.

AC4 avocado plano basic dark 5 star base 3D arm $1795

AC4 poppy red 5 star aluminum base 3D arm $1810

AC4 nero leather 5 star aluminum base ring arm $2775

AC4 snow leather 4 star aluminum base ring arm $2775

Complies with CAL 133 $60 upcharge

Combination changes can be ordered by calling DesignReasons at 215 873 0400

Plano Fabric Orange, Dim Grey, Brown, Dark Blue, Khaki, Nero, Cognac, Avocado, Dark Grey, Stone, Mauve Grey, Poppy Red, Brick. Ice Grey, Coffee, Grey/Stone, Ice Grey/Brown, Poppy Red/Champagne, Yellow/Mustard, Dark Blue/Brown, Grey

Leather Nero, Asphalt, Chocolate, Marron,  Red, Sand, Snow

Casters/Glides Casters hard for carpet, Casters soft for hard floor, Glides for carpet, Felt glides for hard floor

3-zone comfort

A The integrated lumbar zone provides effective and pleasant support. The optional adjustable lumbar support transitions into a flexible zone for the upper back to sink into.

B The flexible zone for the upper back to sink into reduces tension and pressure on the discs and straightens up the neck and head.

C Thanks to the support provided by the shoulder zone, the neck muscles remain relaxed and it is easier for the user to maintain a horizontal view of the screen.

Automatic weight adjustment

The synchronous mechanism with large opening angle and automatic weight adjustment of the backrest resistance ensure that the user’s weight is supported in every sitting position.


The multifunctional 3D armrests can be rotated by 360 degrees, which is very useful with e.g. table-oriented work. The aluminium ring armrests are an elegant variation for conferences, especially when leather-upholstered.


51% of the materials used to produce the AC 4 are recycled and 94% of all materials are recyclable.