The blast then causes a pressure to be applied to the windows and doors for a period of time (duration). This creates an impulse or an amount of energy that is imparted to the window and/or door. A portion of this energy is absorbed by the window and/or door through the flexing of the glazing material. The remainder of the energy is transferred to the framing system and anchors.

Minimal rotation of the frame is allowed to ensure the glazing is retained. United States Bullet Proofing’s engineering professionals perform a complete computer analysis for each blast application. Anchor bolts are analyzed and furnished as part of a system package to ensure design criteria are satisfied during installation.

Ballistic protection level ratings are based on the number of rounds and the size of the weapon(s) posing a threat – from small caliber handguns to high caliber rifles. High caliber, high velocity weapons fire projectiles that deliver a large amount of energy to a door, window or wall system. To be effective, the total system of anchor, frame, door material and glazing material must absorb the energy from the projectile. The framing system must also be capable of stopping the potential threat and retain the glazing system during attack. Installing bullet resistant glazing in a non-certified frame will not ensure the desired level of protection. Any ballistic glazing certified to meet a ballistic standard, must be retained in a certified framing system. United States Bullet Proofing designs the total system of components to achieve the specified level of protection.