DUO 400 Tall Back-Deep Seat
DUO Comfort™ 400 – Dual Density Posture Support Chair
The DUO Comfort™ 400 Tall back is a fully adjustable ergonomic office chair featuring the renowned Dual Density Posture Support Seat — a split-cushion design engineered to encourage pelvic support and sitting comfort.
Certified Quality
- Complies with Australian Standard AS/NZS 4438:1997
- AFRDI Level 6 Certification - rated for extended commercial use
- Weight Rated: 135 kg under normal operating conditions
- Warranty: 10 years (standard 50 hours/week usage)
Ergonomic Features
- Dual Density split-seat cushion promotes balanced posture and reduces pelvic tilt.
- Backrest with 6-position height increments (over 80 mm) via easy in-built ratchet.
- Seat-tilt and back-angle adjustments allow permanent contact support for the lower lumbar spine.
- All adjustments can be performed while seated upright — no twisting or strain required.
- Specified by ergonomic consultants, occupational health, and medical professionals as a proven aid to encourage good posture through seat posture support.
Upholstery
- Supplied in Pure New Commercial-Grade ECO Wool upholstery.
- In-stock upholstery option: Living Fabrics Chelsea ECO Wool - a durable, breathable, and sustainable commercial grade Australian wool upholstery fabric.
- Custom fabric and colour selections available on request.
Summary
This flagship ergonomic task chair sets the industry benchmark for posture-supportive seating - combining a proven Australian design concept, long-term durability and clinical ergonomic performance.
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Primary System: S E A T™
Supporting: S E E™ | A R M S™ | S P A S™
S E A T™ - Pelvic Support
Improve pelvic stability
Maintain spinal alignment
Supported seat comfort
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™ |
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The core is R E P O S E™ - the natural low-load comfort
achieved when Vision Support Reach and Movement are aligned.
- DUO Comfort™ Dual Density Posture Support Seat
- Seat Width 550mm
- Seat Depth 520mm DEEPER SEAT
- Seat Height 490-600mm
- Seat Tilt Range 12°
- Back 480 x 600mm TALL BACK
- Backrest Height 560-630mm
- 135Kg 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 400 Tall Back-Deep Seat
The DUO Comfort™ 400 Tall back is a fully adjustable ergonomic office chair featuring the renowned Dual Density Posture Support Seat - a split-cushion design engineered to encourage pelvic support and sitting comfort.
In-stock upholstery option:
Living Fabrics Chelsea ECO Wool - a durable, breathable, and sustainable commercial grade Australian wool upholstery fabric.
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Who is it for?
For taller users or users requiring deeper seat support and a taller back profile. Suitable where standard seat depth or back height may be insufficient for correct alignment.
Suitable Environments
Tall-user workstations, executive/admin workstations, commercial offices, government seating programs and ergonomic fit-outs requiring size-specific seating.
“Our P O S T U R E Comfort Model™ helps you
achieve sustainable comfort through four integrated
elements - working together to support Natural R E P O S E™…
Ergonomic task chairs are designed to support seated posture, stabilise the pelvis and enable adjustable comfort during desk-based work.
Problem to Solve
Fixed or poorly designed seating leads to posterior pelvic tilt, spinal collapse and fatigue during prolonged sitting.
Framework Application
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S E A T™ - Primary
Seating Geometry
The Dual Density split-seat system is the primary ergonomic feature, promoting pelvic support and helping maintain natural spinal alignment.
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A R M S™
Secondary
Reach Mechanics
Optional armrests support forearm loading during keyboard and mouse tasks and help reduce upper shoulder tension.
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S P A S™
Supporting
Posture Variation
Posture variation and movement throughout the day.
DUO Comfort™ 400 – Dual Density Posture Support Chair
The DUO Comfort™ 400 Tall back is a fully adjustable ergonomic office chair featuring the renowned Dual Density Posture Support Seat — a split-cushion design engineered to encourage pelvic support and sitting comfort.
Certified Quality
- Complies with Australian Standard AS/NZS 4438:1997
- AFRDI Level 6 Certification - rated for extended commercial use
- Weight Rated: 135 kg under normal operating conditions
- Warranty: 10 years (standard 50 hours/week usage)
Ergonomic Features
- Dual Density split-seat cushion promotes balanced posture and reduces pelvic tilt.
- Backrest with 6-position height increments (over 80 mm) via easy in-built ratchet.
- Seat-tilt and back-angle adjustments allow permanent contact support for the lower lumbar spine.
- All adjustments can be performed while seated upright — no twisting or strain required.
- Specified by ergonomic consultants, occupational health, and medical professionals as a proven aid to encourage good posture through seat posture support.
Upholstery
- Supplied in Pure New Commercial-Grade ECO Wool upholstery.
- In-stock upholstery option: Living Fabrics Chelsea ECO Wool - a durable, breathable, and sustainable commercial grade Australian wool upholstery fabric.
- Custom fabric and colour selections available on request.
Summary
This flagship ergonomic task chair sets the industry benchmark for posture-supportive seating - combining a proven Australian design concept, long-term durability and clinical ergonomic performance.
Primary System: S E A T™
Supporting: S E E™ | A R M S™ | S P A S™
S E A T™ - Pelvic Support
Improve pelvic stability
Maintain spinal alignment
Supported seat comfort
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™ |
The core is R E P O S E™ - the natural low-load comfort
achieved when Vision Support Reach and Movement are aligned.
- DUO Comfort™ Dual Density Posture Support Seat
- Seat Width 550mm
- Seat Depth 520mm DEEPER SEAT
- Seat Height 490-600mm
- Seat Tilt Range 12°
- Back 480 x 600mm TALL BACK
- Backrest Height 560-630mm
- 135Kg 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.
