Lotto Medium Back Mesh Operator Chair
Hartley Task Medium Mesh Back Chair
A versatile, space-efficient ergonomic staple for modern workspaces.
The Hartley Task Medium Mesh Back Chair is a proven favorite for commercial office fitouts, admin hubs, and home workspaces. Designed with a mid-height Promeshâ„¢ backrest, synchro mechanism, and independent seat and back tilt controls, it adapts seamlessly to your movements throughout the day. Includes removable 3D adjustable armrests as standard, carries a heavy-duty 135kg load capacity, and is backed by a 10-year commercial warranty.SKU:
F-HARTLEY TASK
- Categories: Operator Chairs
- Weight: 51.25 kg
- Dimensions: L: 762 x W: 324 x H: 629
- Availability: Express Dispatch
- Product Type: Simple
Mid-Back Ergonomic Design Built for Daily Performance
Not every workspace needs a full high-back executive chair. The Hartley Task Medium Mesh Back Chair provides a more compact, open feel while delivering targeted ergonomic support where you need it most. Featuring a high-tension black Promeshâ„¢ backrest (490mm height), it promotes active airflow to keep you cool, paired with a high-resilience molded foam seat pan (500mm W x 480mm D) that cushions pressure points during long working sessions.
Synchro Mechanism & Intuitive Adjustment
Stay comfortable as your posture shifts from task to task. The integrated synchro mechanism synchronises the tilt of the backrest and seat pan, providing fluid movement that supports your spine through dynamic workdays:
- Synchronised Tilt & Gas Lift: Smoothly recline while keeping your feet planted, with a gas-lift seat height adjustment range of 440mm to 520mm.
- Independent Back & Seat Pan Tilt: Fine-tune the angle of the seat and backrest individually to lock in your preferred posture for typing, reading, or collaborative meetings.
- Included Adjustable & Removable Arms: Easily adjust armrest height to align with your desk surface, or remove them completely for tight clearance requirements or specific task freedom.
Certified Eco-Friendly & Commercial Tough
The Hartley Task chair combines sleek styling with robust commercial durability and environmental performance:
BIFMA Tested
Independently certified for structural integrity, drop-impact safety, and long-term mechanical reliability under daily office conditions.
GreenGuard GOLD Certified
Tested for low chemical emissions (VOCs), ensuring healthy indoor air quality across commercial offices, schools, and home environments.
135kg Commercial Capacity
Heavy-duty 5-star base and class-4 gas lift engineered to support up to 135kg.
10-Year Commercial Warranty
Guaranteed long-term return on investment for company fitouts and workstation upgrades.
Where the Hartley Task Excels
- Corporate & Open-Plan Workstations: Ideal mid-back height that doesn’t block sightlines.
- Admin & Customer Service Hubs: Durable, breathable mesh built for daily 8+ hour use.
- Meeting & Boardroom Spaces: Clean aesthetic with synchro tilt for flexible seating.
- Home & Hybrid Study Nooks: Compact footprint suitable for tighter room dimensions.
- Education & Training Facilities: GreenGuard GOLD certified for low emissions.
Care & Maintenance Instructions
- Mesh & Fabric: Vacuum regularly with a soft brush attachment to remove dust. Spot clean fabric with a mild upholstery cleaner or damp microfiber cloth.
- Base & Castors: Periodically check castors and clear any lint or debris from around the wheels to ensure smooth rolling across carpet and hard floors.
- Gas Lift & Levers: Wipe down mechanism components annually; no external lubrication required.
Additional information
| Weight | 51.25 kg |
|---|---|
| Dimensions | 762 × 324 × 629 mm |
| Assembled Depth | 605mm |
| Assembled Width | 620mm |
| Assembled Height | 920mm |
| Back Height | 490mm |
| Seat Width | 500mm |
| Seat Depth | 480mm |
| Seat Height | 440-520mm |
| Weight Rating | 135kg |
| Warranty | 10 Years |
Installation & Assembly Guide
Product Documentation
Technical Line Drawing
A synchro (synchronised tilt) mechanism links the motion of the seat pan and the backrest at an ergonomic ratio (typically 2:1). As you recline back, the seat angle tilts slightly upward to maintain support under your thighs and keep your feet planted firmly on the floor. This encourages dynamic sitting and continuous spinal support throughout the workday.
Yes. The Hartley Task comes standard with adjustable armrests that can be set to match your desk height, reducing shoulder and forearm strain. If you prefer an armless task chair—or need the chair to tuck fully under compact return desks and low workspaces—the armrests can be unbolted and removed easily without compromising structural stability.
The 490mm mid-back profile delivers dedicated support through the lumbar and mid-thoracic zones while maintaining an open, uncluttered aesthetic across open-plan offices and study areas. The high-tension Promeshâ„¢ fabric provides continuous airflow, preventing heat buildup and perspiration during extended work sessions.
- BIFMA Tested: Validates that the frame, gas lift, synchro mechanism, and base have passed rigorous international commercial safety, drop impact, and cyclic wear tests.
- GreenGuard GOLD: Certifies that the chair meets stringent chemical emission standards for volatile organic compounds (VOCs), ensuring cleaner indoor air quality in air-conditioned offices, schools, and home study rooms.
The commercial Class-4 gas lift adjusts seat height smoothly from 440mm to 520mm. The high-resilience moulded foam seat cushion measures 500mm wide by 480mm deep, providing ample support for standard commercial desks and multi-user workstations.
The chair is built with a heavy-duty 5-star nylon spider base and reinforced mechanism rated for commercial user capacities up to 135 kg, designed for standard 8+ hour daily task use.
The Hartley Task Medium Mesh Back Chair is backed by a 10-Year Commercial Warranty, covering the synchro mechanism, gas cylinder, 5-star base, castors, moulded foam cushion, and Promeshâ„¢ backrest against manufacturing defects.
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