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Chair back height; for models with a variable back height (see "Adjustments"), as a rule, the maximum value is indicated.

The back height is measured from the seat to the top edge. In essence, this is the height of support available to the back. In some situations, you can not pay much attention to this indicator - for example, if the chair is intended for visitors and the role of the back in it is purely symbolic. However, if you have to sit in a chair often and for a long time, this point should also be taken into account. Ideally, it's best to try a few chairs "live" and find out which backrest height is most comfortable for you. If this is not possible, it is worth deciding which area on the body the back should reach (to the shoulder blades, to the base of the neck, etc.) and measure at what height from the seat this area is in a sitting position. And if you need specific support for the back of the head, you should choose among models equipped with head restraints (see above).

Dimensions of the seat installed in the chair in width and depth (from the back to the front edge). For models with variable depth (see "Adjustments"), the maximum value is taken into account when the seat is pushed forward to the stop.

Most modern chairs are designed for the average adult, so paying attention to size is primarily for people of a large, or, conversely, miniature physique. In width, the average is considered to be 45 – 55 cm, the narrowest models are up to 40 cm wide, in the widest it can exceed 60 cm. Similarly, a depth of less than 40 cm is considered small, up to 60 cm — medium, more than 60 cm — large.

Seat height from the floor. The optimal height for a person of average height is considered to be 40 – 50 cm, however, this moment is largely subjective, and the comfort of the chair for a particular user depends heavily on his preferences and physique. Thus, many models have the ability to change the height in a certain range (see "Adjustments"). To choose, it is best to determine “live” at what height you are comfortable sitting, and find a model with the appropriate characteristics.

A type of mechanism that provides various adjustments (see below).

— Permanent contact. A mechanism designed to ensure constant contact between the back of the seated person and the back of the chair. Accordingly, the adjustments available when using it relate only to the back, but the list of such adjustments is quite extensive: in height, inclination and depth of the back. At the same time, permanent contact is found mainly in inexpensive chair models.

— Freestyle. Also known as a permanent back support mechanism. Another fairly simple option, concerning only the adjustment of the back of the chair. The back and seat in such models are connected by a flexible plastic cover, which contains a spring; due to a special screw, it is possible to change the degree of compression of the spring, thus adjusting the degree of swing stiffness.

— Tilt(swing). Also known as Top Gun. A mechanism that provides the possibility of rocking back and forth, as well as adjusting the rocking stiffness; in addition, in most cases it also provides the adjustment of the seat height according to the principle of the piastres described above. The adjustment knob is responsible for two functions — gas lift control and swing blocking; rocking stiffness is usually controlled separately. This type of mechanism involves a rigidly connected back and seat.

— ...href="/list/897/pr-28623/">Deep Tilt(deep swing). A variation of the tilt mechanism (see the relevant paragraph), which, in accordance with the name, provides the possibility of a deeper swing. Simply put, in such a chair you can lean back very far, almost lie down. However the seat and backrest in such models are still rigidly connected to each other, and fixation is provided only in one position — vertical (working).

This option is typical mainly for products of the middle and higher price range.

— Freelock. Like the Tilt described above, this mechanism allows free swing and stiffness adjustment. In such chairs, however, fixation in one position is not provided — on the other hand, the backrest in them does not have a rigid connection with the seat and can be separately adjusted in height and inclination.

— Multiblock. In fact, it is an improved and supplemented version of the Tilt described above. Multiblocks not only allow you to swing and adjust the rigidity of the swing, but also provide the possibility of fixing the chair in four positions (instead of one). In addition, they are usually equipped with so-called “anti-shock effect”: when unlocking, the tilt of the chair does not change on its own, for this you need to apply a little effort. This prevents jerks and shocks to the occupant's body when the mounts are released.

— AnyFix. A kind of swing mechanism that allows you to fix the chair in any intermediate position — and not only in those specified by the manufacturer, as is the case with Tilt and multiblocks (see above). Provides maximum freedom in tilt adjustment, however, it is quite expensive.

— MultiFix. Another, along with AnyFix, is a kind of tilt mechanism that allows you to fix the chair in any intermediate position. In fact, from the point of view of the user, these mechanisms fundamentally differ only in name. Accordingly, the advantages and disadvantages of "multifixes" are the same: on the one hand, this is convenience in setting up, on the other hand, a higher cost than, for example, "tilts". Also note that the seat and back in such chairs are usually rigidly connected and lean together.

— Synchro mechanism. The name of this mechanism is due to the fact that the back and seat in it are synchronized in a special way: when swinging, they do not deviate in the same way, but in a ratio of 2:1. It is believed that this provides an anatomically optimal fit to the position of the human body when bending back. In addition, such mechanisms usually have several fixed tilt positions, rocking stiffness settings and an anti-shock system (described in detail in the “Multiblock” paragraph above). This option is considered one of the most suitable for high-quality "director's" chairs (see "Purpose").

— Asynchronous. The asynchronous mechanism assumes the presence of a back and a seat that can change the slope independently of each other; usually, both there and there several fixed provisions are provided. Such designs provide ample features for customization to individual preferences, but the customization itself is not as convenient as in most of the advanced mechanisms described above.

— Piastre. One of the simplest mechanisms, found mainly in low-cost-level models. Allows you to change only the height of the seat. The operation of the mechanism is based on the action of a gas lift — a sealed reservoir with a piston, where gas is pumped under high pressure. The gas lift is located in the support column of the chair, under the seat, and the handle is usually located on the side of this column, within reach of the person sitting, for adjustment. Pressing this knob unlocks the seat and you can adjust the chair as you wish – raise it up and let the gas lift push the seat up, or push it down and lower the height. When the handle is released, the seat is fixed in the predetermined position. Gas lifts are often used in conjunction with other options described below, and the “piastre” type includes only structures that do not have other mechanisms for adjustment — these are mainly low-cost-class chairs.

— React. Mechanism developed by Legett&Platt; React's specific feature is that it combines the rocking of the back with the movement of the seat back and forth. This, according to the creators, provides the most comfortable and at the same time natural movement of the body when swinging. Another interesting feature is that React does not require manual adjustment to the user's weight, the mechanism itself regulates the effort required for swinging. There are usually as many as 8 fixed positions. Armchairs with such a mechanism may outwardly resemble models for staff (see "Purpose") — in particular, they have a back and seat clearly separated from each other — however, with all its advantages, React is not cheap, as a result of which Still, it's more for leaders.

– Relaxing Active System. Another high-end "anatomical" movement, designed for the most comfortable and natural movement; used mainly in furniture from the company Elano. Like the React described above, it combines the swing of the back with the movement of the seat back and forth; in addition, it may also be possible to change the inclination of the headrest depending on the inclination of the backrest. At the same time, chairs with the Relaxing Active System are usually made in a solid classic design, using leather, which makes them look rich and representative, but they also cost accordingly.

— Aircraft. A variation of the rocking mechanism used primarily in AMF chairs. In chairs with this feature, the place of attachment of the seat to the stand is not located in the centre of the seat, but closer to the front edge, at the very knees. This is believed to provide additional comfort and a more natural body position than traditional binding arrangements. Otherwise, this mechanism is similar to the Tilt systems (see above).

— Double springs. A mechanism based on a twin spring that supports the back of the chair and creates impedance when the seated person leans back. The impedance of the springs can be adjusted, thus changing the angle by which the backrest will deflect under the weight of the user. This mechanism is used in some gaming chairs (see "Purpose").

The ability to change the force required to tilt the chair (or only the backrest, if the seat is fixed). Swing stiffness adjustment provides adjustment to the weight and preferences of the individual user.

The armrests closed in a contour having direct connection with a back of a computer chair. Full size armrests are available in both adjustable and non-adjustable versions. In models with adjustable positions, the height of the armrests changes in conjunction with the adjustment of the angle of the backrest.

The height of the armrests installed in the chair relative to the seat. In models that have the ability to adjust the armrests in height (see "Adjustments"), the range of such adjustment is usually indicated.

The overall comfort of using the chair depends on the height of the armrests, but this parameter is largely subjective: even people of the same height can differ in physique and personal preferences. So if comfort is of fundamental importance to you, it is best to check live what armrest height is optimal and choose a chair with the appropriate specifications.

The material from which the chair seat is made directly. Note that individual models can be produced in several versions, differing in the material of the seat.

— Textile. The fabric can have many varieties, and specific characteristics depend on the price category of the chair. And this material is found in all categories — from low-cost models to rather expensive products. The common properties of all types of fabric are low cost, durability, as well as undemanding maintenance.

— Skin. The main distinguishing features of genuine leather are the rich appearance and the corresponding cost. Thus, this material is considered "image" and is used not only for comfort, but also to emphasize the status of the owner. Accordingly, most chairs with leather seats are designed for executives (see "Appointment") and are in the premium class. On the practical side, the leather is durable, quite pleasant to the touch, but poorly breathable (which can create discomfort in hot weather).

— Leatherette. A variety of artificial materials that mimics the natural leather described above. The quality and properties of a particular leatherette, usually, directly depend on its cost (and the price category of the chair in general), but even the most expensive options are usually cheaper than leather — despite the fact that outwardly and even in sensations they can be almost indistinguishable from i...t. In addition, this material is not so demanding to care for. Thanks to this , leatherette seats are quite common. Their main disadvantages are the tendency to scuffs and, in general, a shorter service life than leather ones (but again, a lot depends on the price).

— Plastic. Plastic seats are typical of the most inexpensive chairs designed for visitors — or for staff who do not have to sit in one place for a long time. This material is characterized by low cost combined with strength, reliability and an abundance of colours. At the same time, it has one key drawback, which actually nullifies all the described advantages — hardness; Simply put, sitting on plastic is uncomfortable. Because of this, even among the models mentioned, all-plastic seats are very rare.

— Wood. The word "wood" in the case of seating for office chairs usually refers to plywood. This material is in many ways similar to the plastic described above, but it also has some differences: on the one hand, it has an aesthetic appearance with original patterns and is considered more pleasant to the touch, on the other hand, it costs more and provides relatively few design options. However, such a disadvantage as hardness is also characteristic of this material, which is why it is also used only in isolated cases.

— Net. Seats in the form of a rigid frame, in which a fabric or synthetic mesh is stretched. The main advantages of such designs are light weight and good breathability. The design of the nets allows them to be used even in executive chairs. Of the noticeable shortcomings of mesh seats, one can only single out a slightly lower reliability and greater complexity of repair than those of largely similar fabric seats (see above).