1) Why refurbished (and not “any” used)?

Thorough refurbishment: inspection of frame, mechanism, gas lift and castors, deep cleaning and functional verification before dispatch.

Clear warranty: at FactoryOficina, refurbished chairs have 1 year and new ones 2 years.

Logistics: free shipping in mainland Spain; assembly is charged separately.

Explore our refurbished office chairs and, if you prefer, new models from leading manufacturers.

2) Standards and dimensions that matter (EN 1335 and ISO 9241-5)

EN 1335 (Europe) sets dimensional requirements (seat height, backrest, etc.) and test methods to ensure appropriate adjustment ranges.

ISO / UNE-EN ISO 9241-5 covers workstation layout: neutral posture, individualised adjustments and user training (chair + desk + display + keyboard).

Complete your setup with refurbished office desks or new desks, and add refurbished storage or new storage.

3) Must-have adjustments (and how they affect you)

Seat height

It should allow your whole foot to rest on the floor. If you’re very tall/short, check the gas lift range.

Seat depth (slider)

Leave 2–5 fingers between the seat front edge and the back of the knee; avoid popliteal compression. Ideal if you share the chair or have varied sizes.

Lumbar support

Adjustable in height and, if possible, in depth. Good support prevents fatigue and pain.

Backrest tension and locking

The backrest should follow your movement and enable micro-postural changes throughout the day.

Adjustable armrests

Key to unload shoulders/neck and align forearms to the keyboard.

4) Mechanisms: synchronous, tilting and permanent contact

Synchronous: seat and backrest move together in a ratio (≈2–3:1), maintaining lumbar support when reclining; allows tension and lock adjustments. Ideal for intensive use.

Tilting: seat and backrest tilt as a single block; comfortable but less precise for maintaining optimal angles.

Permanent contact: the backrest continuously follows the back; less common in today’s high-end segment.

5) Armrests 2D, 3D, 4D: what they mean

• 2D: height + width (or pivot)
• 3D: adds depth (forward/back)
• 4D: adds pivot/fine width; maximum personalisation

Quick set-up: adjust height to support forearms without shrugging; depth to bring you closer to the desktop; and pivot inwards if you type close to the body.

6) Materials and spares: what to check on refurbished units

Backrest in mesh (breathable and conforming) vs upholstery (plusher feel). For the seat, look for suitable foam density to avoid a “hammock” effect.

Bases and castors: aluminium or reinforced polyamide base; soft castors for hard floors and hard castors for carpet.

If you’re fitting out a full office: refurbished storage or new storage to round it off.

7) Sizes and body types (tall, short, XL)

Tall (≥185 cm): tall gas lift, high backrest and seat with slider. Armrests with a wide range and width adjustment.

Short (≤160 cm): short gas lift or footrest if the desk won’t lower; slider to bring the edge closer; armrests that go low enough to fit under the desktop.

XL: reinforced base and gas lift, wider/deeper seat, suitable castors. Check the model’s rated load.

8) Express buying checklist

1. Height range and slider (if you share the chair) — feet on the floor and a gap behind the knees.
2. Lumbar adjustable in height/depth — matches your lumbar curve.
3. Mechanism — preferably synchronous with tension and locks.
4. 3D/4D armrests — forearms supported without shrugging.
5. Castors for your floor + play-free gas lift; stable base.
6. Condition of seat/backrest — no deformation or play.
7. Warranty — refurbished 1 year / new 2 years.
8. Logistics — free shipping in mainland Spain; assembly charged separately.

9) Frequently asked questions (FAQ)

What warranty do the chairs have?

Refurbished chairs have a 1 year warranty and new ones 2 years.

Is shipping free? Is assembly included?

Shipping is free in mainland Spain. Assembly is charged separately.

What is a “synchronous” mechanism and why is it recommended?

The backrest and seat move together in proportion, maintaining lumbar support when reclining. It allows you to adjust tension and locking.

Mesh or upholstery?

Mesh breathes and conforms; upholstery feels plusher. Prioritise lumbar support and good seat density.

How do I know if it complies with EN 1335?

Check the model’s technical sheet and verify the adjustment ranges. EN 1335 sets the dimensional references for office chairs.

10) Useful links within FactoryOficina

• See refurbished task chairs
• See new chairs
• Refurbished office desks
• New desks
• Refurbished storage
• New storage
• More guides on our blog