Vinyl Cleanroom Task Chair with 21-1/2" to 31-1/2" Seat Height task chair provides round-the-clock reliability for cleanroom environments such as electronics, pharmaceutical, medical device industries, and other critical manufacturing environments. Filtration system traps particles for contamination-free comfort. Backrest is shaped for full back support and includes a heavy-duty polypropylene back shell to protect the upholstery. I Range and 300 lb. Weight Capacity, Bl