The LVR6000 is an extremely rugged fixed air louver design constructed and certified to SD‐STD‐01.01 DOS Hogh Powered Rifle and 60 min. Forced Entry protection. With Norshield's industry leading engineering and materials, this product delivers the highest level of physical security and force protection with a free area approaching 49%. The LVR6000 is suitable for a variety of applications and tested to maximum standards. Air flow data available upon request.