Loading... Please wait...

How to Install a Replacement Gas Cylinder for Aeron Chairs

Which Size Aeron Chair Do I Have?

Posted by

Bookmark and Share

How To Tell Which Size Aeron Chair I Have

If you're not sure which size Aeron chair you have, our guide will help. Aeron chairs come in three sizes- A, B, and C. A is the smallest, and C is the largest. You can determine the size of your chair by feeling underneath the plastic rim of the top of the chairback. You will feel a bump(s) or a dot(s). There will be ONE dot for A, TWO dots side by side for B, and THREE dots in a triangle for C.

Can't figure out which size Aeron chair I have?

Another method to determine your Aeron chair size is by turning your chair over and looking on the tag. It's usually located underneath the seat. There will be a model number like this: AE...W_............ In this example, the letter that appears after the "W" is your chair size.

What size Aeron chair do I have?

After you have figured out what size Aeron you have, you can go ahead and order the part you need from our website:

Refurbish My Aeron Chair Accessories Kit


Aeron replacement seats-

Size A


Size B


Size C


Aeron Replacement Backs (all sizes):


Foam inserts (all sizes):


Lumbar pads:

Clone (sizes A and B only)


Size A


Size B


Size C


Posturefit Kits:

Size A


Size B


Size C


If you have any further questions, please contact us by clicking here.


Bookmark and Share

How To Install Your Replacement Aeron Lift

How to Install Your New Pneumatic on Your Aeron Chair If your Aeron chair sinks whenever you sit in it, the gas cylinder (a.k.a. gas shock, cartridge, pneumatic, hydraulic, piston, lift) has gone bad. For installation of your replacement Aeron chair cylinder, you will need: A mallet (preferably metal vs. rubber for more force) or hammer A [...]

Read More »