A non-oil, particulate low maintenance respirator. It uses a patented coaxial valving system to make it the coolest, most comfortable low maintenance available today. The worker breathes through separate intake and outflow channels. This patented process helps avoid the uncomfortable common in disposables. Designed for welding, as the swept-back profile fits easily under a welding helmet. Can also be used for many applications with solid particulates and non-oil based aerosols. The replaceable filter makes the respirator a good economical choice over disposable respirators. 42CFR84 Approved. Complies with OSHA Standards.