What is a pneumatic cylinder on a drafting chair and how does it work?

A pneumatic cylinder on a drafting chair is a sealed chamber containing compressed nitrogen gas that supports the user's weight and allows smooth height adjustment. Pulling up the adjustment lever releases a valve, letting the gas expand and raise the seat. Sitting while pressing the lever compresses the gas and lowers the seat. The cylinder also absorbs shock from sitting down abruptly. Quality cylinders are tested to thousands of adjustment cycles before failure. OfficeFurniture2go.com stocks chairs with robust pneumatic systems — call 1-800-460-0858.