In today's uncertain and volatile environment, it is critical for buildings to withstand an explosion with no harm to occupants and as little property damage as possible. For this reason, blast mitigation has become a more prominent concern when designing commercial buildings and is often a requirement for government buildings.
Blast mitigation for windows involves the ability to withstand the vast pressures of an explosive blast. Plus, the glass must remain in the opening to prevent debris and glass itself from entering the building.
The testing protocol for blast mitigation certification is, by nature, very stringent. Testing and certification has been determined by the U.S. General Services Administration (GSA), as described below.
|Performance Condition||Protection Level||Hazard Level||Description of Window Glazing Response|
|1||Safe||None||Glazing does not break. No visible damage to glazing or frame.|
|2||Very High||None||Glazing cracks but is retained by the frame. Dusting or very small fragments near sill or on floor acceptable.|
|3a||High||Very Low||Glazing cracks. Fragments enter space and land on floor no further than 3.3 feet from the window.|
|3b||High||Low||Glass cracks. Fragments enter the space and land on the floor no further than 10 feet from the window.|
|4||Medium||Medium||Glazing cracks. Fragments enter space and land on floor and impact a vertical witness panel at a distance of no more than 10 feet from the window at a height no greater than 2 feet above the floor.|
|5||Low||High||Glazing cracks and window system fails catastrophically. Fragments enter space impacting a vertical witness panel at a distance of no more than 10 feet from the window at a height greater than 2 feet above the floor.|
Kolbe Teutonic® Series fixed and tilt-turn windows are available with options to meet blast mitigation requirements. The following windows have met the test requirements for the Unified Facilities Criteria Department of Defense Minimum Antiterrorism Standards for Buildings.
|Product Type||Tested Size||Result|
|Tilt-Turn Window||35-3/4" x 79-3/4"||Conditions 1 & 2 per GSA criteria*|
|Fixed Window||36" x 79"||Condition 2 per GSA criteria*|
|*Only units with North American frames were tested.|