Logic 400 24 Hour Chair


The chair can be adapted to give full support to suit everyones individual needs.

It provides constant back support, which is extra important for back pain sufferers and those sitting for long periods.

RH Logic 400 24 hour has an extra wool layer in the seat and back to enhance ventilation and comfort. Current upholstery options are either Black Leather or 24/7 Fabric

RH Logic 400 is tested and approved to EU standards (EN 1335, compliant with ISO 7173 for control room chairs).

Fabric Swatch 24/7

This chair complies with al EN 1335 standards

Click here to try out the chair or book a free ergonomic consultation



Armrests - 4D Rotating...
€199.26incl VAT
Neckrest - Height & Angle...
€119.31incl VAT


€2,430.48incl VAT

Prices quoted are ex VAT

Constant Back SupportThe Logic 400 24/7 Chair provides constant back support, when you lean forward to type or lean back to answer the phone.

Back and seat pads or just the fabric can be replaced easily to prolong life even further, reducing the total cost of ownership.

How is it different from other chairs?

It is a chair that fits the user.  The Logic 400 will continue to support your back while you lean forward to type or back while you are on the phone.  A chair made for you.  As you sit in it you will feel the difference.  A genuine orthopaedic chair for the office.

The Logic 400 can be adapted to suit the individual, taking into account their height and weight so that the correct loading is placed on the body.

The degree of neck and lumbar support needed is also taken into account, resulting in a chair that fits you,  follows your smallest movement and gives you full strain relief, support and comfort.


Constant Back Support in every sitting position

The back is fully supported in every sitting position.

A chair based on the movements of the human body (Important for back sufferers)

Many chairs carry the label “orthopaedic chair” without any solid basis for this description.  Sit in the Logic 400 and you will feel the difference.

The Logic 400’s design is inspired by the human anatomy, and by two joints in particular – the knee and the hip. You will notice the effect as soon as you sit down.

First of all,

The lumbar support remains in the correct position, regardless of your movements, which helps facilitate an upright posture. This is because the backrest height remains constant, regardless of the seat angle.



Complete Upper Back and Lower Back Support while reading

Your feet always remain in contact with the floor, minimising the pressure against the underside of your thighs, which eliminates numbness due to restricted blood circulation becaues the vertical movement of the front of the seat is minimal when leaning backward or forward.

Your next position is your best position.

As office work often involves prolonged and constrained sedentary work, the introduction of a chair that encourages movement can add huge benefits to health of worker.


A chair which promotes dynamic and active sitting like the RH Logic 400 is a very important preventative measure and solution to these problems.


This 24/7 Chair the Logic 400 gurantees full back support.  You back will have constant back support while you work with the pressures of a controll room environment.


24/7 ChairLogic 400 Back Care Chair Specification;



Suitable for individuals


up to 150kg


between 5' 4" - 6' 4" approximately


Extend Armrests Rotating
This 24/7 Chair has extra padding with improved ventilation in the seat and back pad.

incl. lumbar pump: width 440 mm, height 620 mm

Seat: width 465 mm, depth 475 mm (seatslide 60 mm)

Seat height: 410–530 mm (4Q)

Base in graphite aluminium (5X) and castors for carpeted floors (65 mm)

Optional Armrests: Adjustable in height and width. Rotating. Armrest height above seat 215–295 mmLogic Neckrest from KOS

Optional Neckrest: Height and depth adjustable

Lead time is approximately 4 weeks



Lead time on this chair is approximately 4 weeks.   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 re chair set up.


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.

Logic 400 Instructions

Filter reviews

Best I've had and I've had a few
Alex O. on 20/08/2016 Comfort to a new level!
Love the leather and support
Darragh F. on 16/04/2017 Great feedback from the operators
Great support!
Thomas F. on 28/09/2016 The guys love it. I rob it on them the odd time for a bit
Very comfortable. Thanks
Liam C. on 25/05/2017 Very supportive!
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!

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

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