Extend Medium Back

About This Product

This chair comes with seat slide as standard.

Price £563.00 (Ex VAT)
Fabric colour:
Optional Installation, Set Up and Training

Select this option to get the most from your purchase. One of our highly trained IST team will deliver the chair, show you what the knobs and levers do, explain good posture and demonstrate how to adjust everything for maximum comfort so that you can do it yourself in future.


Offers an outstanding specification for the price. 

The RH Extend is designed to give the best possible support, whilst encouraging dynamic sitting. As standard, the chair comes with a medium back rest, aluminium base and castors for carpeted floors. The 200 model additionally features an independent seat-tilt/back-angle adjustment, so these can be set precisely according to the user's needs. Options include pivot-top arm rests and a neck support. Either model is available in an ESD variant, if required.

Downloadable instructions


  • Outstanding specification for the price.
  • Ingenious synchro/slide mechanism (Model 100) for optimum support in all positions.
  • Integrated, easy-access controls and infinite-lock rocking action.
  • Also available in high back, click here to view the RH Extend High Back.
  • Alternative armrest option (pivot top) is available.
  • These ergonomic chairs are made to order and delivery may take up to 2 weeks (we do not charge your credit card until we are ready to despatch).
  • Winner of the Fira Ergonomics Excellence Award.

See also:


Please look at our comprehensive list of Chair Features & Benefits.

Feature Availability
Synchronous Mechanism Standard
Asynchronous Mechanism No
Free Float (Rocking) Feature Standard
Independent Seat Tilt Adjustment No
 Independent Back Angle Adjustment No
Seat Slide Standard
 Adjustable Lumbar Support No
Pelvic Support No
Height Adjustable Arm Rests Option
 Width Adjustable Arm Rests Option
Depth Adjustable Arm Rests Option
Independently Adjustable Head Rest No
 Independently Adjustable Neck Rest Option
Suitable for Clean Room No
ESD (Anti Static) No
Suitable for 24 Hour Use Option

Part Number: RH-EXMED



Part Number


Type (Low, Medium, High Back, Split Seat/Back) Medium
Weight (Packed) (kg)


Weight (Un-Packed) (kg) 28
Seat Height Adjustment (Y/N/O) Y
Back Height Adjustment (Y/N/O) Y


Maximum Weight Capacity

133kg - 21 Stone

A - Back Height (mm)


B - Lumbar Height (mm) NA
(B) - Pelvic Support (mm) NA
 C - Chair Arm Height (mm) 215-295
D - Seat Depth (mm)


E - Seat Height (mm)


F - Seat Width (mm) 460


What our customers say

"I'm writing to formally feedback my thanks to you for the time that you spent going through my assessed needs / personal requirements and for the empathy, professionalism and respect you showed to me as well as the knowledge you shared with me."

MW - Student at The University of Hull

Sign up to our newsletter

IIRSM Logo | Osmond Ergonomics

Investors In People | Gold

RSZ Seal Colour Safe Contractor | Osmond Ergonomics

UKAS And Locations | Osmond Ergonomics

WEEE | Osmond Ergonomics