you require a protective industrial curtain wall that prevents light from either outdoor or indoor sources from getting through, consider industrial blackout curtains from Steel Guard Safety. These curtain walls are completely opaque to block out sunlight, welding flames and other types of light for a variety of applications. These curtain walls not only block out light, but they also protect employees and equipment from damage caused by welding sparks and other hazards in the workplace. They are constructed using top quality materials, and are customizable in order to meet your space requirements.