Action Bullet Resistant's BR150/250/450 2 1/2" x 4 1/2" fixed curtainwall system is specifically engineered to protect against ballistic threats from levels 1-8. Available in clear, dark bronze and black anodized finishes as well as custom painted and mill finish. Both thermal and non thermal options are available in custom sizes and configurations to suit the needs of any project. BR150/250/450 is a screw spline system that mulls together which translates into savings in field installation time.