B9331 - Office chair BOSS - Free user manual and instructions
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| Type of product | Office chair |
| Model | B9331 |
| Brand | BOSS |
| Recommended usage | Daily professional and home office use |
| Overall height | 110 - 120 cm (adjustable) |
| Seat height | 45 - 55 cm (pneumatic lift) |
| Seat width | 50 cm |
| Seat depth | 48 cm |
| Backrest height | 60 cm |
| Armrests | Adjustable with soft pads |
| Tilt mechanism | Rocking with lock |
| Weight capacity | 120 kg |
| Net weight | 11 kg |
| Base material | Nylon five-star base |
| Casters | 60 mm caster wheels (floor-friendly) |
| Upholstery material | Breathable mesh and PU leather |
| Frame material | Reinforced steel |
| Adjustability | Height, tilt, armrests, and tension |
| Assembly required | Yes, tools included |
| Maintenance | Wipe with damp cloth; vacuum mesh regularly |
| Safety features | Stable base and gas lift certified |
| Repairability | Spare parts available from BOSS support |
| Warranty | 2-year manufacturer warranty |
| Certifications | ANSI/BIFMA and EN 1335 compliance |
Frequently Asked Questions - B9331 BOSS
How do I adjust the seat height on the BOSS B9331 office chair?
Lift the pneumatic lever located under the seat while sitting on the chair. Your body weight will lower the seat; releasing the lever locks it in place at the desired seat height.
Can the armrests be adjusted?
Yes, the armrests on the B9331 can be adjusted in height by pressing the small button on the side of each armrest and sliding the pad to your preferred position. This helps reduce strain during long working hours.
How do I clean and maintain the mesh backrest?
Use a soft brush or vacuum with a brush attachment to remove dust and debris from the mesh. For stains, lightly dampen a cloth with mild soap and water, then wipe and air dry. Avoid abrasive cleaners.
What is the maximum weight capacity of this chair?
The B9331 supports up to 120 kg. Exceeding this limit may damage the gas lift or base and void the warranty.
Are replacement casters available?
Yes, replacement casters can be ordered directly from BOSS customer service. The chair uses standard 60 mm caster wheels, which are also compatible with many other office chairs.
How do I adjust the tilt tension?
Turn the round tension knob located underneath the front edge of the seat clockwise to increase resistance, or counter-clockwise to decrease it. Adjust until you feel comfortable leaning back.
Does the chair come with assembly tools?
Yes, an hex key and a ring spanner are included in the box. The assembled components are minimal, so assembly typically takes 15-20 minutes.
Can I lock the rocking mechanism?
Yes, the multi-function tilt mechanism includes a locking feature. Pull the tilt lock lever forward to secure the seat in an upright position, or push it back to enable rocking.
Is the chair suitable for hard floors?
The standard casters are designed for both carpets and hard floors. However, for delicate wooden floors, BOSS offers optional soft-floor casters that can be purchased separately.
How do I contact BOSS support for spare parts?
Visit the official BOSS website and navigate to the customer service section. You will need your model number (B9331) and proof of purchase to order parts under warranty.
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USER MANUAL B9331 BOSS
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Product information
Brand : BOSS
Model : B9331
Category : Office chair