SR 591 WELDING SHIELD is design for use either by itself or in combination with a respiratory protection system. The welding shield is designed for easy use and operation. Adjustable head harness for best comfort. The SR 591 can be equipped with different types of welding filters. To get the best and appropriate respiratory protection you can choose to use it with either SR 900 half mask with remote filter holder SR 905 or with our powered fan unit SR 500 or SR 700 in the highest protection level (TM3). You can also use the SR 900 with our SR 507 compressed air attachment in class 3A/3B.