Our clean room chairs have been tested to Fed Std.209E and ISO 14644-1 requirements (Class 10/ISO Class 4). Ergonomic benefits include an adjustable back rest with lumbar support for increased comfort during extended sitting durations, contoured waterfall design, over 65 antimicrobial/antibacterial standard and custom vinyl color configurations, and molded polyurethane cushioning. The 5-leg polished cast aluminum base prevents tipping, and is designed specifically for use in clean room environments. These bases can be fitted with non-marring chrome hooded casters or non-marring bell glides. Optional foot rings are available in 20-inch diameter chrome. Each ergonomic Basic Clean Room chair is backed by our 15-year warranty, lifetime on the pneumatic cylinder. Chairs shipping to California or Massachusetts may be subject to state mandated fire treatment and may be subject to an up-charge.