Office Chair & Dormitory Adjustable Chair

There are various types of office chairs and dormitory adjustable chairs, and when purchasing, it is necessary to comprehensively consider functions, adjustment mechanisms, and safety.

I. Common Types and Characteristics

1. Classification by Adjustment Functions

   • Ergonomic Chair: Taking the Sihoo M90 as an example, the seat height can be adjusted within the range of 45-55 cm, suitable for people with calf lengths of 43-53 cm (corresponding to a height range of 165-185 cm). Its core functions include adjustable armrests, reclining lock, and a coordinated design of the lumbar support and headrest, which can fit the body's curves through multi-dimensional adjustments and relieve fatigue from prolonged sitting.
   • Simple Swivel Chair: Such as the TOAIP7 constellation chair, it features an armless design, supports 360-degree rotation, and has a slightly reclining backrest, making it suitable for flexible posture changes in small spaces (such as dormitories), but it lacks fine adjustments for lumbar support and headrest.

2. Classification by Lifting Mechanisms

   • Pneumatic Lifting Chair: It achieves smooth lifting through a high-pressure nitrogen gas cylinder, with light operation and low noise, and is currently the mainstream choice. It is essential to check whether the gas cylinder has passed TUV, SGS, or BIFMA certifications to avoid the risk of explosion from inferior cylinders.
   • Hydraulic Lifting Chair: It relies on hydraulic principles to control height, with a slower adjustment speed but strong stability, commonly found in high-end office chairs, but with higher costs and more complex maintenance.
   • Mechanical Lifting Chair: It is manually adjusted through a screw rod or buckle, with a simple structure but low adjustment precision, often seen in budget-friendly products.

II. Key Points for Purchase

1. Adaptability

   • Height Matching: Choose according to the seat height adjustment range to ensure that when the feet are flat on the ground, the thighs and calves form a 90-degree angle. For example, the seat height range of the Sihoo M90 is suitable for people of medium height, while shorter or taller individuals should prioritize models with a wider adjustment range.
   • Space Limitations: In dormitory environments, priority should be given to the chair's swivel radius and storage convenience. An armless design (such as the TOAIP7 constellation chair) can save horizontal space.

2. Support

   • Lumbar Support: Avoid fixed lumbar supports and prioritize independent lumbar supports that can be adjusted up and down or forward and backward to ensure they fit the lumbar curve.
   • Headrest: Choose a headrest that can be adjusted in height and rotation to ensure that the neck support point aligns with the earlobes, reducing cervical spine pressure.

3. Material and Comfort

   • Seat Cushion: Avoid overly soft materials (such as pure sponge), which are prone to collapse after long-term use. It is recommended to choose high-density sponge or mesh composite structures that balance support and breathability.
   • Mesh Fabric: Choose mesh fabric with moderate elasticity and tear resistance. Overly soft mesh can cause the buttocks to sink, while overly hard mesh affects breathability.

4. Safety

   • Gas Cylinder Certification: It must pass TUV, SGS, or BIFMA certifications, and the certification marks are usually printed on the bottom of the gas cylinder or the packaging.
   • Chassis Stability: A five-star base is more stable than a four-star one, and the material should preferably be steel or high-strength nylon to avoid the risk of plastic base breakage.