High Back Velvet Ergonomic Home Office Desk Task Chair – Product Documentation

The high back velvet ergonomic home office desk task chair features a steel frame construction with a nylon five-star base and dual-wheel casters. The seat and high backrest are upholstered in polyester velvet fabric with multi-layer foam padding. The chair includes a class 3 gas lift for height adjustment, a synchronized tilting mechanism with adjustable tension, and 3D movable armrests. The backrest is designed with a built-in lumbar support pad adjustable within a vertical range of 5 cm. The velvet fabric has a Martindale abrasion rating of 50,000 cycles and includes a stain-resistant fluorocarbon coating. The chair complies with BIFMA X5.1-2017 standards for office seating. The tilt mechanism allows a recline angle of up to 135 degrees with a lockable position at 90, 105, 120, and 135 degrees. The maximum load capacity is 120 kg.

Core Advantages

Backrest height: 58 cm from seat surface, providing support from lumbar to upper thoracic spine (C7 to L5 vertebrae).

Gas lift: class 3 (TÜV certified), height adjustment range 10 cm (from 46 cm to 56 cm seat height).

3D armrests: adjustable in three axes – height (7 cm range), horizontal slide (3 cm), and pivot angle (30 degrees inward).

Lumbar support: mechanically adjustable pad, vertical travel 5 cm, protrusion 2 cm. Position lock via friction mechanism.

Tilt mechanism: synchronous knee-tilt design with multi-lock positions. Tension adjustment via rotating knob under seat.

Seat dimensions: width 52 cm, depth 50 cm. Seat foam density 55 kg/m³ with molded shape for thigh support.

Velvet fabric: 100% polyester, 380 gsm, Martindale 50,000 cycles, pH neutral, anti-pilling rating 4 (ISO 12945-2).

Product Characteristics & Material Specifications

Frame: cold-rolled steel tube, wall thickness 1.8 mm, powder coated matte black (RAL 9005), thickness 70 microns.
Seat foam: high-resilience polyurethane foam, density 55 kg/m³, ILD 190 N, thickness 8 cm at front edge, 6 cm at rear.
Backrest foam: density 50 kg/m³, ILD 140 N, contoured shape with 4 cm thickness at lumbar region.
Velvet cover: anti-microbial treatment (ISO 20743:2013 tested, 98% reduction of S. aureus after 18 hours).

Base: nylon reinforced with 20% glass fiber, 5-star design, diameter 68 cm. Static load test 1360 kg.
Casters: 65 mm diameter dual-wheel, polyurethane tread, hardness 65 Shore A, two locking casters included.
Mechanism housing: stamped steel plate thickness 3 mm, powder coated black.
Product weight: 18.5 kg. Shipping weight: 21.2 kg. Box dimensions: 82 x 68 x 38 cm.

Application Scenarios

Home office workstations with 8+ hours daily sitting Remote work setups requiring ergonomic adjustability Executive desks in small office environments Creative studios and editing suites Telemedicine consultation workstations Gaming desk setups (compatible with sit-stand desks) Co-working space hot desks with multi-user adjustment needs

Technical Specifications

Product classification	High back velvet ergonomic task chair (fabric home office chair)
Seat height range (floor to seat top)	46 cm – 56 cm (class 3 gas lift)
Overall height	112 cm – 124 cm (depending on gas lift position)
Seat dimensions (W x D)	52 cm x 50 cm
Backrest dimensions (W x H)	51 cm x 58 cm
Lumbar pad adjustment range	Vertical 5 cm, protrusion 2 cm (mechanical)
Armrest adjustment (3D)	Height 7 cm, horizontal slide 3 cm, pivot 30 degrees inward
Recline angle range / lock positions	90 to 135 degrees, lockable at 90, 105, 120, 135 degrees
Tilt tension adjustment	Knob-adjustable torsion spring, range 20 kg to 120 kg equivalent
Maximum static load	120 kg (BIFMA X5.1-2017 compliant)
Base type / diameter	5-star nylon reinforced base, 68 cm spread
Caster specification	65 mm dual-wheel PU casters, two locking, hardness 65 Shore A
Frame finish	Powder coated matte black (RAL 9005), thickness 70 microns
Fabric composition / abrasion	100% polyester velvet, 380 gsm, Martindale 50,000 cycles
Foam density (seat / back)	55 kg/m³ / 50 kg/m³
Gas lift class / certification	Class 3 (TÜV certified), 25,000 cycles under 120 kg
Fire safety compliance	BS 5852 source 0 & 1, California TB 117-2013
Product weight / shipping weight	18.5 kg / 21.2 kg
Packaging dimensions (carton)	82 x 68 x 38 cm (LxWxH)

Frequently Asked Questions & Maintenance Instructions

What is the recommended user height range for this chair?

The chair accommodates users from 155 cm to 190 cm. The 10 cm gas lift range and 5 cm lumbar pad vertical adjustment allow positioning for different torso lengths. For users below 155 cm, a footrest is recommended to maintain proper thigh support. For users above 190 cm, the backrest height may not fully support the shoulder region.

How to adjust the lumbar support correctly?

The lumbar pad moves vertically along two steel rails. To adjust, apply upward or downward pressure directly to the pad while seated. The pad locks into position via friction detents every 5 mm. The optimal position places the pad directly behind the L3-L5 vertebrae, typically 18 cm to 22 cm above the seat surface for average-height users. The protrusion depth is fixed at 2 cm; no user adjustment for depth is available.

How to clean the velvet fabric without damaging it?

Vacuum weekly using an upholstery attachment with low suction. For stains, prepare a solution of 5 ml mild detergent per 500 ml warm water (maximum 40°C). Apply with a white microfiber cloth using blotting motions. Do not rub, as this may flatten the velvet nap. Allow to air dry away from direct heat. The stain-resistant coating remains effective for 20 to 30 cleaning cycles. Avoid steam cleaning or immersion in water.

What assembly is required, and what tools are included?

The chair ships partially assembled. Assembly steps: insert casters into base legs, insert gas lift into base hub, attach seat mechanism to gas lift, mount backrest to seat plate, attach armrests to seat brackets. Included tools: hex key set (4 mm, 5 mm, 6 mm) and a wrench for mechanism bolts. Assembly time: 25 to 30 minutes. Torque specification for M8 bolts: 8 Nm. Do not exceed 12 Nm.

How long does the gas lift last before replacement is needed?

The class 3 gas lift is rated for 25,000 full compression cycles under 120 kg load. Based on 10 adjustments per day, this corresponds to approximately 7 years of use. Signs of gas lift failure include seat height dropping more than 15 mm within 5 minutes of adjustment or inability to maintain the set height. Replacement gas lifts (standard 4 cm diameter) are available as spare parts.

Does the chair have a weight-activated or lockable recline mechanism?

The mechanism is a synchronized knee-tilt design with a multi-lock system. To recline, pull the paddle lever outward and lean back. Release the lever to lock at any angle. The lock positions are continuous within the 90 to 135 degree range; there are no discrete detent positions. The tension knob adjusts the spring resistance; turning clockwise increases resistance, requiring more body weight to recline.

Operational Limitations & Safety Parameters

Maximum rated load: 120 kg. Exceeding this limit may result in gas lift failure, base cracking, or caster damage. Dynamic loads (sudden sitting) should not exceed 100 kg equivalent force.
The chair is intended for indoor office use only. Do not expose to outdoor conditions, humidity above 80%, or temperatures below 5°C, as the gas lift viscosity increases and fabric may develop mold.
Do not stand on the seat or use the chair as a step stool. The gas lift is not designed for vertical point loads from footwear.
Inspect all bolts every 6 months. Re-torque seat mechanism bolts to 8 Nm, armrest bolts to 6 Nm. Loose bolts may cause instability.
The 3D armrests have a maximum vertical load of 15 kg per armrest when leaned upon. Do not use armrests as a sitting surface.
Lock the casters when the chair is used on an incline exceeding 1.5 degrees. The five-star base requires level floor surfaces for stability during recline.
Keep the velvet fabric away from open flames or high-heat sources exceeding 60°C. The material meets cigarette ignition standards but will burn if exposed to direct flame.

Supplementary Dimensional Data

Armrest pad dimensions (L x W)	25 cm x 9 cm, padded with 2 cm foam
Distance between armrests (inner)	48 cm at minimum adjustment, 54 cm at maximum
Seat depth adjustment	Fixed depth (not adjustable)
Backrest width at shoulder level	51 cm (continuous across height)
Floor to caster hood clearance	3 cm
Recommended desk height for ergonomic use	72 cm to 76 cm (floor to desktop) with armrests at standard position
Tilt mechanism thickness	7 cm from seat bottom to mechanism cover
Gas lift cylinder diameter	4 cm (standard for office chairs)