RH Logic 400 (including 8S armrests/neckrest) - Black
The RH Logic 400 is one of the most popular ergonomic office chairs in the world, due to its ergonomic features and excellent durability. It's wide range of independent adjustments allow it to be optimally fitted to the user.
When correctly set up for free by one of our experts, the RH Logic 400 will promote a good sitting posture, maintaining and supporting the natural S shape of the spine.
The RH Logic 400 has a high backrest and comes as standard with 8S class A armrests, lumbar pump, seat slide, castors for carpeted floors, base in graphite aluminium and Gaja fabric.
- Fully adjustable for seat height, back rake angle, back height, seat slide and lumbar support
- Unique '2PP' principle ensures optimum support and blood circulation during dynamic sitting
- Exchangeable seat and back pads to increase longevity and reduce cost of ownership
- Environmental impact is traceable through EPD (Environmental Product Declaration)
- 8S Class A armrests - Adjustable in height and width. Rotating. Armrest height above seat 215–295 mm
- Height and depth adjustable
- Graphite 5X aluminium base
- Castors for carpeted floors
- Seat width:
- 465 mm
- Seat depth:
- 475 mm
- Seat height:
- 410-530 mm
- Seat sliding range:
- 60 mm
- Backrest width:
- 445 mm
- Backrest height:
- 630 mm
- 28 kg
- Maximum user weight:
- 150 kg (23.5 stone)
- 10 years
Q: How do I adjust the back angle of my chair?
There is a row of 3 buttons on the right hand side of your Logic 400. Lift the middle button to adjust the backrest angle. Release the button to lock in place. The angle should be set so that your back makes contact with the backrest.
Q: My gas stem seems a little stiff – is this normal?
Sometimes, over time, the gas stem can become a little stiff when trying to adjust the height. A quick and easy fix for this is using WD-40 or Vaseline. Apply a light layer of grease to the gas stem, then try adjusting the gas stem 3-4 times. The gas stem should now adjust easily.
Q: Can my seat slide forward?
There is a row of 3 buttons on the right hand side of your Logic 400. Lift the button furthest back on the right hand side. About four fingers width between the front edge of the seat and the hollow of the knee provides good blood circulation.
Q: I have lumbar support in my backrest, how do I adjust this?
On the back of the RH Logic backrest is a lumbar pump. Use the pump to inflate the lumbar support to optimal comfort. If you need to deflate your lumbar, simply push the button on the pump.
Q: My chair didn’t come with a neckrest – can I order one to add on myself?
You can retro-fit a neckrest to your Logic 400. Simply remove the small plastic tab on top of your backrest and slot the neckrest in.
Q: How do I stop the rocking motion of my chair?
There is a tilt lock on the right hand side of your Logic 400 at the back. Turn the handle clockwise to lock the chair. To unlock, simply turn the handle anticlockwise.
If you want to adjust the tension of the tilt motion, use the front handle under the right hand side of your seat. Turn anticlockwise for firmer tension and clockwise to loosen the tension.
Q: We have hot-desking and I want to adjust the backrest height – how do I do this?
On the bottom right of your backrest there is a grey handle. Simply pull the handle upwards to adjust the height of your backrest. Once you are happy with the position, push the handle downwards.
Q: My seat has become worn over time – can I just swap a new one for the old one?
Yes, swapping the seat pad is simple. Once you receive your new seat pad, pull off the old worn seat pad. You will notice there are holes underneath around the edge of the seat pad. Simply align these to the seat shell, then push down on the edges to secure the seat pad into place.
Still having problems?
Please give our customer services team a call on +44 (0) 345 345 0010.
The estimated lead time for this item is displayed towards the top of the page, under the short description.
Delivery and installation options
We will deliver the item(s) using a standard courier service. You are responsible for the assembly and set up. We will provide assembly and set up videos and instructions to guide you through the process. See our delivery charges ›
Delivery, installation, set up and support
Our delivery partners Product Care will have you comfortably set up and familiarised with your products at the time of delivery. They’ll also take away and recycle the packaging. This option can be selected in the shopping basket page. Find out more about our delivery and installation service ›
Removal and recycling (chairs and desks only)
The recycling service can be added onto the delivery, installation, set up and support option at an additional cost. Choose this option if you would like your old chair or desk taken away when your new one is delivered. This option can be selected in the shopping basket page. Find out more about product removal and recycling ›
This item is non-returnable
Due to the bespoke nature of this product, that it's specifically made for you, this item is non-returnable.
If in the very unlikely event the item arrives faulty, we will attempt to rectify the situation as soon as possible. Please let us know within 24 hours of receiving the item to make a valid claim.
Contact us about your seating project
Need more than one chair? However big or small your project is, we have a dedicated service to support you. Not only will you get expert advice, trials, delivery and set-up, but you’ll also benefit from great discounts on bulk orders.
To request a no-obligation quote, or to discuss your requirements further, please fill out our contact form and we will get back to you as soon as possible.