RH Activ 303 – Sit/Stand Ergonomic Chair for Counters, Labs and Active Workstations

The RH Activ 303 is a purpose-built ergonomic chair designed for standing-height desks, cashier counters, lab benches, and other active work environments where users shift between sitting and standing throughout the day.

With its high seat height range, compact backrest, and thick padded seat, the Activ 303 offers stability, comfort and support in demanding roles — without the bulk of a traditional office chair. The backrest folds down easily to slide under tight workstations, and the chair includes castors that lock automatically when seated for added safety.

Now also available with a lower gas stem (455–590 mm), the Activ 303 adapts to a broader range of working heights.

Key features

• Adjustable seat height: standard 515–700 mm, or optional 455–590 mm (for lower counters or hybrid use)

• Compact backrest: 280 mm wide × 230 mm high — supports movement and posture without restriction

• Padded seat: 450 mm wide × 428 mm deep with built-in 30 mm extra cushioning

• Seat slide: 50 mm adjustment for leg support

• Automatic locking castors: 50 mm wheels lock under load to prevent rolling while seated

• Slim, adaptable profile: folds to fit tight desk spaces

• Dark grey finish: RAL 7024 lacquered metal and MT11310 plastic as standard

• Chair weight: 13 kg

• Certified: EN 1335, ANSI/BIFMA, GREENGUARD, ISO 14025 (EPD)

Is this chair right for you?

You’ll benefit from the RH Activ 303 if you:

• ✅ Work at a high desk, counter or standing-height bench

• ✅ Need a compact, upright chair that supports dynamic tasks

• ✅ Prefer a model with extra seat padding and auto-locking safety castors

• ✅ Work in labs, healthcare, education, or customer-facing roles

• ✅ Want a durable sit/stand chair with height options for different setups

Customisation options

• Seat height: standard (515–700 mm) or lower lift (455–590 mm)

• Footring: add a 6F footring (Ø455 mm) for extra comfort at raised positions

• Base options: dark grey lacquered aluminium (standard) or polished finish

• Castors or glides: auto-locking castors standard; glides and hard-floor versions available

• Fabrics: choose from hardwearing technical fabrics, antimicrobial vinyl and more

Key specifications

• Seat width: 450 mm

• Seat depth: 428 mm

• Seat slide range: 50 mm

• Seat height: 515–700 mm (standard) or 455–590 mm (optional)

• Backrest size: 280 mm (width) × 230 mm (height)

• Chair weight: 13 kg

• Standards: EN 1335, ANSI/BIFMA, GREENGUARD, ISO 14025 EPD

• Base diameter: 590 mm

FAQs

Is the RH Activ 303 suitable for standing-height desks or counters?
Yes — it’s designed for sit/stand setups. Choose the standard gas lift (515–700 mm) for full standing-height use, or the optional lower lift (455–590 mm) for more compact configurations.

Does it provide proper back support?
Yes — the compact backrest encourages upright posture while allowing full arm and shoulder movement.

Do the castors lock when seated?
Yes — it includes 50 mm castors that automatically lock under load, helping prevent unwanted movement while working.

Can I choose different fabrics or finishes?
Yes — a range of technical, antimicrobial, and cleanroom-friendly options are available. Polished bases and footrings can also be added.

Call to action

Need a chair that works at standing height — without compromising support or safety?
Choose the RH Activ 303, the compact sit/stand solution for today’s agile workspaces.

Explore other options

• Need a lower, more standard task chair? Try the [RH Activ 200]

• Want wider seat or taller back support? See the [RH Activ 222]

• Require ESD protection? View our [ESD-compatible Activ chairs]