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RH Extend 100 Medium Back

£711.00ex. VAT

The RH Extend features RH Forms unique pattern of movement with three articulation points - at the knee, hip and lower back - positioned to complement the body's own joints. This encourages flexible and active sitting, while also assuring support and freedom from tension.

RH Armrests
Armrest Pads
RH Relax Arms
XL Seat
Neck Rest
Coccyx Cut Out
Extended Gas Stem
Coat Hanger
Fabric Colour
Price as configured

RH Extend 100 Medium Back Product Details

Using the rocking action lever, selecting the exact position that suits you best is a simple operation, or you can choose to leave the chair in free-float so that the rocking function comes into play. Whichever setting you choose, you retain an upright posture with maximum support. RH Extend is ideally suited for working in all modern office environments and is also suitable as a multi-user chair if several of you are sharing the same work area.

RH Extend 100 Medium Back Features

  • Synchro tilt float action
  • Back height adjustment
  • Sliding seat
  • Softer feel foam


  • Warranty: 10 Years
  • Weight Limit (Stone): 19
  • Seat Height (cm): 40 - 51
  • Seat Width (cm): 46 (Std) | 48 (XL)
  • Seat Depth (cm): 40 - 50 (Std) | 44 - 54cm (XL)
  • Back Height (cm): 47 - 55
  • Back Width (cm): 44
  • Centre of lumbar curve (cm): 17 - 27
  • Mechanism: Synchro

Pose Evaluation Form

If you require one of our ergonomic chairs and are unsure which model and features you require then please complete our POSE Form below.

Pose Form

Delivery Information

For all delivery only stock orders, we aim to deliver the goods within 4 working days. Not all products shown on the website are held in stock or can be sent via courier ie desktops and therefore the delivery time of these goods may vary. We will keep you updated regularly with estimated delivery times on these goods.


Delivery charges below are for UK mainland only orders. For all other destinations please contact us for a quote or proceed to the checkout and enter your delivery information.

Accessories ordered on their own are charged at £5 + VAT per delivery - this offer is only available for internet orders. All orders including a boxed chair or desk (No Setup) are charged at £15 + VAT per order


The personal delivery and setup charges below are for deliveries to Mainland UK only.

Chair:  £50
Desk:  £50

If you order a Chair and a Desk together then only one £50 charge will apply.


We offer a two week trial period on the majority of products (exclusions do apply ie Software, Headsets etc) which starts from the day you receive your item(s). If you wish to return an item then simply email us at office@backcs.co.uk so we can provide a returns note and number. Upon receipt of the returned items we will issue a full refund excluding any outward delivery charges. Please contact us if you are unsure whether your item would be available on this two weeks return period.

Goods and packaging must be in their original condition and returned within business hours, carriage paid with the returns note enclosed.

If you are returning an item due to a fault or damage then please contact us and we will arrange for the collection of the item(s).

For further information on our returns policy please visit our Delivery & Returns page.