DUO Heavy Duty
Heavy Duty
DUO™ 400 Tall Back - Heavy Duty
Tall-Back Dual Density Posture Support
The DUO™ 400 Tall Back combines the proven DUO™ Dual Density Posture Support Seat with the tallest backrest and larger seat configuration in the standard DUO range.
Its larger seating platform provides more room for users who need additional width and depth, while the tall backrest extends support further through the torso.
The seat retains the DUO principle of softer rear cushioning with a firmer front section, helping create a stable seat–pelvis interface for sustained desk-based work.
Upholstery
- FAST SUPPLY in Australian Living Fabrics Chelsea ECO Wool
- Pure New Commercial-Grade ECO Wool upholstery - durable, breathable and sustainable
- IN-STOCK Colours : BLACKBUTT(Black) : VIOLA ( Navy Blue) : Oniscus CHARCOAL GREY - commercial grade Australian eco wool upholstery fabric.
- Special Custom Order - your choice of fabric and colour - wide range on offer
Key Features
- tall-back ergonomic task chair
- DUO™ Dual Density Posture Support Seat
- larger LS seat
- seat approximately 515 W × 500 D mm
- firmer front / softer rear split-cushion construction
- tall supportive backrest
- adjustable seat height
- forward / backward seat tilt
- adjustable backrest angle
- adjustable lumbar / back-height support
- intuitive adjustments accessible while seated
- commercial-grade upholstery options
- AFRDI Level 6
- AS/NZS 4438 compliant
- 160 kg user weight rating
- 10-year warranty
Support
Elevation
Angles
Tilt
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What this means for you when the 4 elements are aligned
| Corrected screen alignment → reduced neck strain |  - S E E™ |
| Better pelvic support → less lower back fatigue |  - S E A T™ |
| Arm positioning → reduced shoulder load |  - A R M S™ |
| Movement support → reduces static load |  - S P A S™ |
R E P O S E™ Outcome
The DUO Comfort™ 400 Tall Back supports Natural R E P O S E™ through larger seat geometry, pelvic stability and extended back support.
More seat space. Taller back support. The same pelvis-first DUO foundation.
- DUO Seat
- Seat Width 525mm
- Seat Depth 500mm
- Seat Height 490-600mm
- Seat Tilt Range 9°
- Back 480 x 580mm
- Backrest Height 465-600mm
- 160Kg Rated
Warranty: 10 Years
This product is supplied with a 10-year warranty covering defects in materials and workmanship when used under normal commercial office conditions. The warranty applies to structural and mechanical components. Normal wear and tear on soft or consumable elements is excluded.
DUO Heavy Duty
- DUO™ Dual Density Posture Support Seat
- tall supportive backrest
- larger LS seat
- firmer front / softer rear seat cushioning
- forward / backward seat tilt
- adjustable lumbar / back support
Who Is It For?
Suitable for users who:
- require a larger or heavier-duty ergonomic chair
- find standard task-chair dimensions restrictive
- want the DUO pelvis-support system with greater structural capacity
- spend extended periods working at a desk
- require generous seat width and depth
- benefit from adjustable pelvic and lumbar support
- work in government, commercial, professional or intensive office environments
Problem to Solve
A chair can provide good ergonomic adjustment and still be inappropriate if it does not provide enough seat space, structural capacity or support for the individual user.
The DUO Heavy Duty addresses these requirements while retaining the core DUO seating principle.
Its Dual Density Split Cushion Seat combines softer cushioning beneath the rear pelvic region with a firmer front section, helping create a more stable seat–pelvis relationship.
The larger, more robust chair platform then provides the room and durability required for users who need more than a standard task-chair configuration.
S E A T™ — Primary
Support · Elevation · Angles · Tilt
The DUO Heavy Duty supports S E A T™ through:
- heavy-duty seat geometry
- Dual Density split-cushion construction
- softer rear pelvic cushioning
- firmer front seat support
- generous seating dimensions
- supportive backrest
- adjustable seat height
- adjustable seat angle
- adjustable backrest position
- lumbar / back-height adjustment
- controlled posture variation throughout the workday
The objective is not simply to make the chair bigger.
It is to provide appropriate sizing, pelvic support and chair capacity while preserving the movement and adjustability required for sustained sitting.
DUO™ 400 Tall Back - Heavy Duty
Tall-Back Dual Density Posture Support
The DUO™ 400 Tall Back combines the proven DUO™ Dual Density Posture Support Seat with the tallest backrest and larger seat configuration in the standard DUO range.
Its larger seating platform provides more room for users who need additional width and depth, while the tall backrest extends support further through the torso.
The seat retains the DUO principle of softer rear cushioning with a firmer front section, helping create a stable seat–pelvis interface for sustained desk-based work.
Upholstery
- FAST SUPPLY in Australian Living Fabrics Chelsea ECO Wool
- Pure New Commercial-Grade ECO Wool upholstery - durable, breathable and sustainable
- IN-STOCK Colours : BLACKBUTT(Black) : VIOLA ( Navy Blue) : Oniscus CHARCOAL GREY - commercial grade Australian eco wool upholstery fabric.
- Special Custom Order - your choice of fabric and colour - wide range on offer
Key Features
- tall-back ergonomic task chair
- DUO™ Dual Density Posture Support Seat
- larger LS seat
- seat approximately 515 W × 500 D mm
- firmer front / softer rear split-cushion construction
- tall supportive backrest
- adjustable seat height
- forward / backward seat tilt
- adjustable backrest angle
- adjustable lumbar / back-height support
- intuitive adjustments accessible while seated
- commercial-grade upholstery options
- AFRDI Level 6
- AS/NZS 4438 compliant
- 160 kg user weight rating
- 10-year warranty
Support
Elevation
Angles
Tilt
What this means for you when the 4 elements are aligned
| Corrected screen alignment → reduced neck strain | - S E E™ |
| Better pelvic support → less lower back fatigue | - S E A T™ |
| Arm positioning → reduced shoulder load | - A R M S™ |
| Movement support → reduces static load | - S P A S™ |
R E P O S E™ Outcome
The DUO Comfort™ 400 Tall Back supports Natural R E P O S E™ through larger seat geometry, pelvic stability and extended back support.
More seat space. Taller back support. The same pelvis-first DUO foundation.
- DUO Seat
- Seat Width 525mm
- Seat Depth 500mm
- Seat Height 490-600mm
- Seat Tilt Range 9°
- Back 480 x 580mm
- Backrest Height 465-600mm
- 160Kg Rated
Warranty: 10 Years
This product is supplied with a 10-year warranty covering defects in materials and workmanship when used under normal commercial office conditions. The warranty applies to structural and mechanical components. Normal wear and tear on soft or consumable elements is excluded.
