ergonomics · Oct 11, 2026 · 7 min read

How to choose an ergonomic chair: back pain, weight, hours of use and which Dunati chair for each case

How to choose an ergonomic chair based on hours of use, weight, height and back pain: the six settings that matter and which Dunati chair suits each case.

By Leonardo Bianchi, CEO at Dunati

Ilustración de postura correcta al sentarse en una silla ergonómica frente al computador

For eight hours a day, choose a chair with a synchronous mechanism, adjustable seat depth and adjustable lumbar support; If there is lower back pain, those three things outweigh the brand or the high backrest. In the Dunati catalogue, the Axis is the one that brings together the three with the lowest list price. For fewer hours, fewer adjustments are enough, and height, weight and type of work finish defining the model.

What makes a chair ergonomic?

That it can be adjusted to the person who uses it. A comfortable chair for five minutes is not necessarily ergonomic: what prevents discomfort is that, after adjusting it, the body remains in a neutral posture for hours. Occupational ergonomics guides, including those from OSHA in the United States, recommend prioritizing adjustability and testing the chair before purchasing it.

What are the six settings that matter?

  1. seat height

    What should be allowed
    Raise and lower with gas piston
    How to know if it's okay
    Feet flat on the floor, knees at hip height or slightly lower
  2. Seat depth

    What should be allowed
    Slide the seat forward or backward
    How to know if it's okay
    Two to four fingers fit between the edge of the seat and the back of the knee
  3. Lumbar support

    What should be allowed
    Adjust in height and, if possible, in depth
    How to know if it's okay
    It lies in the lower curve of the back, at the height of the belt, without pushing
  4. Apoyabrazos

    What should be allowed
    Adjust in height (2D) and also in width, depth or rotation (3D and 4D)
    How to know if it's okay
    Shoulders relaxed, elbows at 90 degrees and at desk height
  5. Synchronous mechanism

    What should be allowed
    That backrest and seat tilt together, with adjustable tension and locking positions
    How to know if it's okay
    You recline without your feet leaving the floor
  6. Cabecero

    What should be allowed
    Adjust in height and angle
    How to know if it's okay
    Support the back of your neck when reclining, without pushing your head forward

The first three are the ones that most affect low back pain. The synchronous makes the difference between a chair for two hours and one for eight.

Why does your back hurt with an office chair?

Because the chair does not support the lumbar curve and the body compensates for it with muscle. After a while, the pelvis moves backward, the lower back flattens, and the back muscles spend the day working to keep the trunk upright. That is why a soft chair does not provide relief: the padding does not replace lumbar support. ```

What chair should I choose if I have back pain?

If the discomfort is lumbar, look for height-adjustable lumbar support and a seat with adjustable depth: a seat that is too long forces you to sit on the tip and leaves your back without support. The synchronous mechanism allows you to change your posture during the day, which is what provides the most relief.

If the discomfort is cervical or shoulder, check the height of the armrests and the desk before changing the chair. Shrunken shoulders usually come from a standing desk, and that's where you should look at a height-adjustable desk. The headboard helps if you work reclined.

This guide is about fit and ergonomics, not health: if pain persists or worsens, consult a professional.

What chair to choose based on weight and height?

  • People of greater weight: Dunati chairs are suitable for a use weight of up to 120 kg; In other brands, ask for the load capacity declared in the technical sheet, and prefer an aluminum base. The ANSI/BIFMA X5.1 certification is a good sign that the chair passed strength tests.
  • More than 1.85 m: you need a wide height range, adjustable seat depth and high backrest with headboard; If not, the knees are higher than the hips.
  • Less than 1.60 m: It is important that the seat goes down enough and that it is not deep; A footrest solves the desk that does not go down.

Which chair to choose according to the hours of use?

  1. Occasional use (meeting room, visits, 1 to 2 hours)

    What do you need
    Adjustable height, backrest with some recline
    What may be missing
    Adjustable lumbar, adjustable arms
  2. Half day (4 hours)

    What do you need
    Height, reclining backrest, height-adjustable arms
    What may be missing
    Seat depth
  3. Full time (8 hours)

    What do you need
    Six settings, synchronous with locking and adjustable lumbar
    What may be missing
    Nothing: this is the case for which the ergonomic chair exists
  4. Continuous shifts (monitoring centers)

    What do you need
    All of the above, plus reinforced structure and spare parts available; Ask the supplier for a model suitable for continuous use
    What may be missing
    Nada

Which Dunati chair for each day?

  1. Axis

    Category in the list
    Ejecutiva
    Settings
    Synchronous with 3 locking positions, adjustable seat depth, mesh backrest, 2D arms, adjustable lumbar, optional headboard
    for whom
    Full time; the case of low back pain
  2. Amara

    Category in the list
    Ejecutiva
    Settings
    Synchronous with 3 locking positions, depth-adjustable seat, mesh backrest, 3D arms, optional headboard
    for whom
    Full day with a lot of keyboard and mouse
  3. Aquila

    Category in the list
    Gerencial
    Settings
    Synchronous self-weighting with 3 locking positions, adjustable seat depth, 4D arms, adjustable lumbar, adjustable headrest
    for whom
    Many hours and rest; positions used by several people
  4. Grace

    Category in the list
    Operativa
    Settings
    Synchronous with 3 locking positions, mesh backrest, 2D arms, fixed lumbar, optional headboard
    for whom
    Full time in operational positions
  5. Cooper

    Category in the list
    Operativa
    Settings
    Synchronous with lock, mesh backrest, height-adjustable arms
    for whom
    Half-day and shared positions
  6. Arkana

    Category in the list
    Operativa
    Settings
    Mesh seat and backrest, height adjustable, reclining, fixed arms
    for whom
    Occasional use, rooms and visits
  7. Eros (high and medium)

    Category in the list
    Gerencial
    Settings
    High or medium mesh backrest, five-point aluminum base
    for whom
    Management offices and board rooms

Dunati chairs are assembled in Chile with imported components and have a 3-year warranty. If you doubt between Axis and Grace, the difference is in the lumbar and the depth of the seat: for a person who fits with a fixed lumbar, the Grace complies; for a position that will use different heights, the Axis.

Gaming chair or ergonomic chair for working?

To work, ergonomics. A gaming chair is designed for a reclining posture: a fixed high backrest in the shape of an armchair, thick padding and few fine adjustments. An office chair is designed for eight hours in front of a desk, with ventilating, synchronous and adjustable lumbar mesh. To alternate play and work for a few hours, either of the two, well regulated, works.

How does an ergonomic chair fit properly?

  1. Sit at the bottom of the seat and adjust the height until your feet are flat on the floor.
  2. Adjust the depth until there are two to four fingers between the edge of the seat and the knee.
  3. Raise or lower the lumbar support until you feel it in the lower curve of your back.
  4. Adjust the armrests so that your elbows are at 90 degrees, at desk height.
  5. Release the synchronous, regulate the tension to your weight and lock it in the working position.
  6. If there is a headboard, place it where your neck rests when you recline.

In a company, this step is the most forgotten: ten minutes to show each person how to adjust their chair goes further than paying for an extra adjustment.

What mistakes are common when choosing an ergonomic chair?

-Buy for the high backrest.It looks more ergonomic, but it doesn't correct anything if the lumbar is not adjusted to the height of your lower back. -Choosing a chair for the entire team without trying it on anyone.On a team there are very different heights and weights, and the chair that fits the person who chose it can leave others sitting at the top. Try it with several people before purchasing in bulk. -Ignore the armrests.If they do not go under the desk, the person sits far from the deck and loses the backrest. Check that they go down enough or that they can be regulated before deciding. ```

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Where to buy an ergonomic chair in Chile?

Dunati sells its chairs in its online store, https://www.dunati.com, and in its showroom at Av. Vitacura 6577, Vitacura, Santiago, which has parking. Not the entire catalog is always on display, so when coordinating the visit via WhatsApp at +56 9 8583 5709, it is advisable to let us know which models you want to try. For companies, Dunati also lends chairs to evaluate them at the stands before purchasing; coordinates with the advisor.

Chairs in stock have a reference period of up to 3 business days in the Metropolitan Region, with their own office. Outside Greater Santiago, the store's purchases travel by courier, in their box and unassembled, and freight is paid upon receipt. In projects, Dunati also ships and installs in regions and shipping takes between 2 and 3 business days for chair orders.

What makes the price of an ergonomic chair vary?

The number of adjustments, the type of mechanism, the base (aluminum or nylon), the headboard, mesh or tapestry and the purchase volume. In the Dunati price list, operational chairs start from $100,000 + VAT ($120,000 with VAT), executive chairs from $180,000 + VAT ($210,000 with VAT) and managerial chairs from $230,000 + VAT ($270,000 with VAT). For companies, the purchase is by quote with invoice.

How many hours a day justify an ergonomic chair?

From four hours a day you can already see the difference; With eight, it is the most used work tool in the position.

Is the mesh backrest better than the upholstered one?

The mesh ventilates better and adapts to the back; The upholstery is warmer and gives a more executive image. For full-time wear, mesh is the usual choice.

What does synchronous mechanism mean?

That the backrest and seat tilt together in a fixed proportion, so that when you recline your feet remain on the floor.

What warranty do Dunati chairs have?

3 years. Afterwards, Dunati maintains spare parts (armrests, mechanisms, backrests, bases, wheels and pistons) to change only the damaged part.

Can you try the chair before buying?

Yes, in the Vitacura showroom, Monday to Friday 8:30–18:00 and Saturday 10:00–14:00. It is advisable to try it for at least fifteen minutes in the real working position.

How long does delivery take?

Chairs in stock, up to 3 business days in the Metropolitan Region, counted from the business day following confirmation of payment. In regions, days are added depending on the shipment.

Do the chairs arrive assembled?

Purchases from the store outside Greater Santiago arrive in their box, unassembled. In projects, the Dunati team delivers and installs them, also in regions.

Dunati assembles its desk chairs in Chile from imported components. The catalogue lists each model with its adjustments, and you can try them at the Santiago showroom before deciding.

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