Span.Seating

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LUMBAR SUPPORT
Lumbar refers to the lower region of the back.

And lumbar support is a support built into the back of a chair to support the back between the lowest ribs and pelvis keeping even pressure on disks. The support helps the back hold a slightly forward arch.
SEAT WIDTH
It is typically the distance between armrests on a seat. If there is no armrest, the seat cushion is assumed to be the seat width.
Bottom line: the more seat width the better.
ARMREST
An armrest (or arm-rest) is a feature found in most office chairs which the occupants can rest their arms.
Bottom line: the more seat width the better.

CASTERS (CASTORS)
Wheels or rollers that are fitted to a chair base to provide mobility. A caster (or castor) is a single, double, or compound wheel mounted on an object to make movement easier. Found on shopping carts, office chairs and material handling equipment, casters may be fixed to roll in one direction, or mounted on a pivot, such that the wheel will automatically swivel, aligning itself to the direction in which it is moving.

ERGONOMICS
The science of the design of equipment, especially so as to reduce operator fatigue, discomfort and injury.
Bottom line: the more seat width the better.

And an ergonomic office chair is an office seat that has been carefully designed for the user to be able to work productively, efficiently and safely as well as minimizing any feeling of fatigue or discomfort.

CHROME BASE
It is type of base of the chair which is made by electroplating a thin layer of chromium onto a metal object.

NYLON BASE
Nylon base is also a type of base of the chair which is made out of glass filled nylon, with a honey comb structure underneath which makes it light in weight and durable. Honey comb structure helps in dividing the weight evenly on all the five legs of the chair. Nylon base are black in color and is little cheap than chrome base.

LIFT
The segment between the control and the base that allows the occupant to adjust the height of the chair.

Lift can be mechanical - those adjusted by hand from beneath the seat; clutch controlled lift mechanical spin lifts - those adjusted by spinning the chair clockwise or counter-clockwise; or pneumatic (gas) lifts - those which are activated by a handle to raise and lower the chair.

GAS LIFT
Gas lift is a mechanism that allows the use office chair to modify their height in relation to the height of a desk, leading to an increase in comfort and ergonomic benefit.

UPHOLSTERY
Upholstery is the work of providing furniture, especially seats, with padding, springs, webbing, and fabric or leather covers. The word upholstery comes from the Middle English words up & holden, meaning to hold up. The term is applied to domestic furniture and also to applications in automobiles and boats. A person who works with upholstery is called an upholsterer; an apprentice upholsterer is sometimes called an outsider or trimmer.

MODULAR
The terms refers to anything constructed with standardized units or dimensions allowing flexibility and variety in use; for example "modular furniture"; "modular homes"

SYNCHRO TILT MECHANISM
A mechanism that allows the seat & back to tilt at a variable angle. Seat tilts less while the back tilts a longer angle for optimum comfort. In other words, the backrest tilts at a higher ratio than the seat encouraging proper posture.

Technically, the seat tilts by 1 degree whereas the back tilts 2.2 degree in relation to the seat.

KNEE TILT MECHANISM
A mechanism where the seat & back tilts with the same ratio of tilting angle. The body weight

This mechanism allows you to gently rock while your feet remain flat on the ground. You dial the spring tension to suit your weight and more or less float. Remember, increased movement is preferable to static postures. This type of ongoing gentle movement can have therapeutic effects for people who would otherwise work in rigid postures for hours on end. The mechanism allows for both locked and free float mode. For instance when the phone rings while you are in the free float mode, and you shift the weight of your arms back from the keyboard, the chair will float back into a reclining position. Without effort or adjustment to the controls, you have moved to a different and more comfortable posture. This is the beauty of the knee tilt.

PERMANENT CONTACT FEATURE
This feature allows the back to be supported in all positions while seated. The lumbar region and the upper back are continuously supported keeping the spine in its natural curve.

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