Gas lift information
An office chair gas lift (or pneumatic cylinder) is a sealed, pressurized unit that enables smooth seat height adjustment, typically using compressed nitrogen gas. It serves as the central support column connecting the seat mechanism to the base and is a crucial component for ergonomic seating.
There are two parts to a complete gas lift unit. The 28mm pressure cylinder and the 50mm outer casing. The pressure cylinder is the section, that when activated, allows the chairs to go up and down. High-quality lifts are typically SGS/BIFMA or BS-certified for safety and durability.
Types of gas lifts;
- GL7
- GL8
- GL9
- GL11
- GL15 (counter height)
Available in Black or Chrome.
Standard gas lifts:
Drop through gas lifts:
The term 'drop-through' is where the cylinder casing passes through the base, often requiring more clearance below than standard gas lifts, common in pyramid style bases.
- GL7DT
- GL8DT
- GL9DT
Long drop through gas lifts:
- Enigma 70/30
- Enigma 50/50
Sometimes very old chairs have obsolete gas lifts, these look like this;
Signs your gas lift may be failing
- Gradual sinking
- Oil leaks
- Failure to rise
If a chair continuously sinks or won't hold its height, the inner seals have likely failed, causing it to lose pressure. It is generally not possible to refill the gas cylinder. However, the unit is usually replaceable rather than needing a new chair.
How to measure a gas lift
Helpful 'How to' videos and instructions