The 6000 Drop Down Series is a reusable respirator that offers the user comfort and convenience. Use for workers who wear hard hats and need to frequently remove the respirator without removing the hard hat. Each facepiece is remarkably comfortable, 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.