Office work chair – Type A

Type A Chairs must have the following functions:

Seat depth shall be adjustable.

The seat inclination must be adjustable by at least six degrees.

Seat height shall be 400mm minimum and the adjustment range should be at least 120mm.

Adjustments of the backrest are independent of the seat surface. Armrests should be adjustable in height, depth and width.

Office work chair – Type B

This is the most common office chair sometimes referred to as office task chairs.
Type B chairs can have independent backrest adjustments in relation to the seat surface, but it is not compulsory.

The backrest should be adjustable in height to ensure the lumbar area is properly supported.

Armrests should be adjustable in height as a minimum requirement

Dimensionally, they are the same as type A chairs except for the minimum seat height, which is 420mm and the minimum seat height adjustment range, which is 100mm.

Office work chair – Type C

The type C chairs are dimensionally similar to the type A chairs, but can have:

Reduced seat height adjustment range (minimum adjustment range of 80mm instead of 100mm) Extra long seat depth

No independent backrest tilt in relation to the seat

Arms are usually not adjustable and offer little if any support.

Type C chairs often tend to be very large chairs with bulky upholstery and limited adjustability. These chairs may or may not satisfy the minimum requirements of the DSE regulations.