Ergonomic Office Chair Extend HB

CH Extend 120 8S


The Ergonomic Office Chair Extend HB is a flexible, elegant ergonomic office chair that is exceptionally easy to use.

The Extend High Back Office chair is user friendly, easy to adjust and durable, an ideal solution for office fit outs.

The Extend has achieved the Ergonomic Excellence award from F.I.R.A.

All controls are conveniently located on the right while all adjustable parts of the chair are clearly marked.

The design of the Extend is based on 2PP (Two Point Principle) unique philosophy of ergonomics, which results in your feet remaining on the ground and your back being supported at all times.

Gaja Fabric Swatch. We stock Gaja Black.

This chair complies with all EN 1335 standards

Out Of Stock, Contact for more information.

Alternative product listed below:


Ergo High Back Office Chair K204
€736.77incl VAT


€1,201.71incl VAT

Prices quoted are ex VAT

Extend Constant Back SupportThe Extend Office Chair is a high preforming office tool.  Its intuitive design makes it the ideal choice for today’s ever-changing workplace.

The movement of the chair is based on the principles of upright posture and active sitting.   This ensures that your body receives the variation and support it requires as you move.

The Extend HB Office chair offers a backrest and seat angles that move simultaneously when you change your position.  As the chair’s basic settings do not change, this helps you to do more and perform better.

Extend Back Support in every sitting positionThe Extend chair is also available in other models, with a larger back rests and with a back angle adjustment.

The backrest on the Extend HB is equipped with a ”Tvedts” cushionproviding superb support for the whole upper body.  The shape of the backrest encourages movement and the height is adjusted with the simple push of a button.

The controls for the height and depth of the seat are all conveniently located on the right-hand side of the chair.  The correct height improves blood flow in the legs while the correct seat depth provides greater comfort and support.  The tilt mechanism is infinitely adjustable, with a smooth action that can be locked in any chosen position.

Extend Complet Back supportDynamic seating means the chair follows your every movement regardless of working position providing complete support, enabling you to always sit correctly and breathe properly.
The seat provides excellent support and has a waterfall edge to reduce pressure on the underside of the thighs, aiding circulation.  It is also designed to keep you positioned in the middle of the seat, even when it is inclined forward.

The resistance of the tilt mechanism is simply adjusted according to body weight and height. This allows this office chair to follow your movements without the need to exert muscular force to push the chair into new positions.

Armrests are optional but are recommended since they provide relief for the shoulders.  They are adjustable in width and depth with a rotating function.

Specification:Extend Neckrest width and depth adjustable


Suitable for individuals
up to 133kg
between 5' 4 - 6' approximately


Overall depth:  430-490mm


Seat depth:  470mm


Seat width:  460mm


Overall height:  400-510mm


Seat angle adjustment:  +5 degrees - -8 degrees


Height of lumbar support above the seat:  170-245mm


Backrest height:  620mm


Backrest height adjustment from seat:  650-725mmRotating Armrests width depth and height adjustable armrest


Backrest width:  440mm


Back angle adjustment:  20 degrees


Height of armrest above seat:  210-290mm


Distance between armrests:  385-505mm


Diameter of base:  660mm


We stock black, other colours have a 4 week lead time


This chair complies with al EN 1335 standards.



We stock this chair in Black.


In stock, goods will be dispatched from our ware house within 2-3 business days.  


Other colours have approximately a 2 week lead time.  We will email you with a delivery date nearer the time.


Box delivery with our courier.


Our experienced chair consultant will be in touch with you to ensure your chair is set up to suit your individual needs.


Returns policy.


In the event of receiving this chair damaged on delivery please let us know within 24 hours of receipt so that you can make a valid claim.


If you change you mind on purchase, please notify us within 14 day of purchase should you wish to return items.  You will need to ring for a Returns Note Number, which you will need to quote when returning items.   Goods must be unused, unopened, in a saleable condition and in their original packaging. 


If the item has been sent in error or is defective KOS will arrange collection and return.  Otherwise the onus is on the customer to arrange and pay for the return of the items.


Refunds will be issued on receipt of returned goods in saleable condition.







Annette Shannahan - Owner ..

We at Abbey Physio and HealthcareDirect have worked very effectively and on many occasions with Seamus and the team at Kos Ergonomics when seeking solutions and resolving work-related...

Eileen Murphy - Physiotherapist ..

I recommend patients to KOS. They have experience and expertise with ergonomic solutions for patients with particular problems. When they sell a chair, they ensure that the chair is fitted...

Padraic O'Fiynn - Ergonomist ..

Since 2006, working as a chartered ergonomist with KOS Ergonomic solutions has greatly contributed to an early and safe return to work mainly for staff and where necessary students of the...

Kathleen Treanor - Ergonomist ..

I Kathleen Treanor have worked collaboratively with KOS and Seamus Kennedy since 2000. We have worked together with many organisations both public and private, to provide professional...

Sarah Carry - UCD ..

Since first contacting KOS Ergonomic Solutions in 2010, l have found their service reliable and efficient, combining excellent customer service and product expertise with a range of ergonomic...

Eileen Hannon - Stryker ..

KOS Ergonomic Solutions has supplied us with chairs for our Beading Room which have been very beneficial to the safety and comfort of our employees working in this area. These chairs are used 14-18...

Alison Minter - Paypal ..

Just wanted to say thank you for the quick and efficient service over the last year. It’s been a pleasure dealing with you and I would highly recommend KOS to anyone

Irene O'B - Physio & Ergonomist ..

Following a fall from a bicycle I sustained a T10 (mid back) wedge fracture with no nerve damage. I also reinjured my neck having sustained a whiplash injury some 20 years previously. Three months...

Karol Fitzgerald - Athlone IT ..

As I informed you previously to my numerous back problems, resulting from fracturing a couple of vertebra in my lower back a number of years ago. This later caused disc to slip, trapping nerves...


KOS Ergonomics Ireland

Since 1991, we have been working with companies and individuals as the leading provider of ergonomic office furniture in Ireland.

We currently provide a full ergonomic service from office to home with our ergonomic homeworker packages, sit stand desks , ergonomic chairs , remote assessments and KOS Ergonomic program management software.

Discover our wide range by booking a showroom consultation or by shopping online!

Visit Our Showroom

We can provide you with a VDU Assessments when you visit our showrooms in Dublin or in Holycross in Tipperary.

Read more

Accept Site use cookies