The half facepiece 6000 Series is a reusable respirator that offers the user comfort and convenience. Each facepiece is remarkably com-fortable, soft, lightweight and easy to adjust. The half facepieces are each available in 3-sizes (S, M and L). The low-maintenance design helps minimize time required to maintain the product; just clean as directed between uses and help reduce the need for expensive repair programs. NIOSH approved for negative pressure air purifying and positive pressure dual airline applications.