1. Introduction
Thank you for choosing the VOUNOT Ergonomic Office Chair. This chair is designed to provide optimal comfort and support for extended periods of sitting, featuring adjustable lumbar support, a breathable mesh backrest, and multiple adjustment functions. Please read this manual carefully before assembly and use to ensure proper function and longevity of your chair.

Image 1.1: VOUNOT Ergonomic Office Chair in a typical office environment.
2. Safety Information
- Maximum Weight Capacity: Do not exceed the recommended maximum load of 105 kg (231 lbs).
- Proper Use: Use the chair only for its intended purpose as an office chair. Avoid standing on the chair or using it as a step stool.
- Assembly: Ensure all components are correctly assembled and all screws are tightened before use. Periodically check all fasteners to ensure they remain secure.
- Children: Keep children away from the chair during assembly. Do not allow children to play on or with the chair.
- Floor Protection: Use a chair mat on sensitive floor surfaces (e.g., hardwood, laminate) to prevent scratches from the casters.
- Maintenance: Do not use abrasive cleaners or harsh chemicals on any part of the chair. Refer to the maintenance section for cleaning instructions.
3. Package Contents
Please verify that all parts are present before beginning assembly. If any parts are missing or damaged, contact customer support.
- Backrest (1)
- Seat Cushion (1)
- Armrests (2)
- Base (1)
- Casters (5)
- Gas Lift Cylinder (1)
- Mechanism Plate (1)
- Hardware Pack (Screws, Allen Key)
4. Assembly Instructions
Follow these steps carefully to assemble your VOUNOT Ergonomic Office Chair. It is recommended to assemble the chair on a soft, clean surface to prevent damage.
- Attach Casters to Base: Insert the five casters into the holes at the end of each leg of the chair base. Push firmly until they click into place.
- Insert Gas Lift: Place the gas lift cylinder into the center hole of the assembled base.
- Attach Mechanism Plate to Seat: Align the mechanism plate with the screw holes on the underside of the seat cushion. Ensure the front of the mechanism faces the front of the seat. Secure with screws using the provided Allen key.
- Attach Armrests to Seat: Attach the armrests to the sides of the seat cushion using the designated screws. Do not fully tighten yet.
- Attach Backrest to Seat/Armrests: Align the backrest with the mounting points on the mechanism plate and armrests. Secure with screws. Once all screws are in place for the backrest and armrests, tighten all screws firmly.
- Connect Seat Assembly to Gas Lift: Carefully place the assembled seat and backrest onto the gas lift cylinder, ensuring the tapered end of the gas lift fits securely into the mechanism plate.

Image 4.1: Detailed view of chair components for assembly.
5. Operating Instructions
Your VOUNOT Ergonomic Office Chair offers several adjustments to customize your seating experience.
5.1. Seat Height Adjustment
To adjust the seat height, locate the lever on the right side under the seat. While seated, pull the lever up to lower the seat. To raise the seat, stand up slightly and pull the lever up. Release the lever at the desired height.
5.2. Backrest Recline and Lock
The backrest can recline between 90 and 120 degrees. To recline, pull the lever on the left side under the seat outwards. Lean back to the desired angle and push the lever inwards to lock the backrest in position. To unlock, pull the lever outwards again.
5.3. Lumbar Support
The chair features adjustable lumbar support designed to conform to the natural curve of your spine. The lumbar support is integrated into the backrest mesh. Adjustments are typically made by the natural flex of the mesh and the ergonomic design.
5.4. Swivel and Mobility
The chair offers 360-degree swivel capability and smooth-rolling casters for easy movement across various floor surfaces.

Image 5.1: Illustration of chair adjustment levers and recline range.

Image 5.2: User demonstrating the chair's recline function.
6. Maintenance
Regular maintenance helps prolong the life and appearance of your office chair.
- Cleaning: Wipe down plastic and metal parts with a soft, damp cloth. For the mesh backrest and fabric seat, use a mild soap solution and a soft brush, then wipe with a clean, damp cloth. Allow to air dry completely.
- Avoid Harsh Chemicals: Do not use abrasive cleaners, solvents, or strong detergents, as these can damage the materials.
- Check Fasteners: Periodically (every 3-6 months) check all screws and bolts to ensure they are tight. Re-tighten if necessary to maintain stability and safety.
- Caster Care: Keep casters free of hair and debris to ensure smooth movement.
7. Troubleshooting
If you encounter any issues with your chair, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Chair is unstable or wobbly | Loose screws or bolts | Check and tighten all assembly screws, especially those connecting the seat, backrest, and armrests. |
| Difficulty adjusting seat height | Gas lift cylinder malfunction or lever obstruction | Ensure the height adjustment lever is not obstructed. If the issue persists, the gas lift may need replacement. Contact customer support. |
| Backrest does not recline or lock | Recline mechanism jammed or lever not fully engaged | Check the recline lever for obstructions. Ensure the lever is fully pulled out to recline and fully pushed in to lock. |
| Casters do not roll smoothly | Debris in casters or damaged casters | Remove any hair or debris from the caster wheels. If casters are damaged, they may need replacement. |
| Squeaking noises | Loose connections or friction between parts | Tighten all screws. Apply a small amount of silicone lubricant to moving parts if necessary, avoiding contact with fabric. |
8. Specifications
Key technical specifications for the VOUNOT Ergonomic Office Chair:
- Model Number: 8502778659165
- Overall Dimensions (L x W x H): 63.5 x 63.5 x 104.14 cm (25 x 25 x 41 inches)
- Seat Dimensions (W x D): 49 x 51 cm (19 x 20 inches)
- Seat Height Range: Adjustable, up to 54 cm (21 inches)
- Backrest Width: 49 cm (19 inches)
- Item Weight: 8.9 kg (19.6 lbs)
- Maximum Recommended Load: 105 kg (231 lbs)
- Materials: Stainless steel (frame), Carbon fiber, Plastic, Mesh (backrest), Foam (seat), Sponge (filling)
- Color: Black
- Recline Positions: 2 (90 to 120 degrees)
- Special Features: Ergonomic design, Adjustable height, Reclining backrest, Swivel function, Rolling casters, Armrests

Image 8.1: Dimensional diagram of the VOUNOT Ergonomic Office Chair.

Image 8.2: Comparison of seat and base dimensions.
9. Warranty and Support
For warranty information or technical support, please refer to the purchase documentation or contact your retailer. Keep your proof of purchase for any warranty claims.