BEVCO’s Integra ISO 4 Cleanroom Series is an upholstered chair that offers around-the-clock reliability for work environments which need to meet particulate goals of ISO 14644-1 . A unique filtration system traps particles for contamination-free comfort and has been tested by an independent laboratory to certify compliance to ISO 4. The Integra makes working easy! The medium backrest is specifically shaped to provide ample back support and comes standard with a heavy-duty polypropylene back shell to protect the upholstery. The generous seat provides an exceptional seating experience while the thick, resilient, high-density foam provides long-lasting comfort. This articulating tilt model features simultaneous seat and back adjustments to properly position the angle of the chair for increased comfort during extended sitting durations. The pneumatic height adjustment allows you to easily change your seat height from " - 22". Ergonomic adjustable arms enable the user to relieve neck and shoulder tension. Upholstered vinyl is antibacterial; antifungal and complies with CAL 117. This chair comes with a sturdy 25" diameter polished aluminum base. Model comes standard with dual wheel hard floor casters.