High Back Asynchronous Chair. Sonix Choices offers a stylish range of operator seating that provides both high quality and great value. Certified by FIRA as having passed BS EN1335: (2000): Part 2 for strength, safety and stability. Quality, affordable, hardwearing fabric favoured on many lines. 100% Pyratex, 60000 rubs. Bs 7176: 1995 Direct Test for Medium Hazard premises. PYRA fabrics are suitable for use in premises categorised as Medium Hazard.. BS EN 1021 - 1&2: 1994. BS 5852 Section 4, NI5 (passes cigarette and match ignition source 5). UNI 9175/87 - Class M1 Note. Computer or at-desk tasks are part of work, typically 7-8 hours a day. Ideal for secretarial, word processing, clerical, professional and accountancy jobs. Up to 18 stone/114kg. Asynchro movement allows you to move the seat back to any position you choose, to maximise comfort. Users can adjust height of seat to maximise support for legs. Optional fixed arms, Height-adjustable arms and De Luxe Height-adjustable arms available. WxDxH: 480x460x480-590mm. Backrest Height: 510mm. Colour Perth.