Forcible Entry Demonstrations
Page 12
Air-blast Resistant Window Systems
Break, vent, and clear times for the laminated single-paned units were comparable to the
daylight film configurations, but were less than for the attached-film configurations.
Heavier tools tended to improve the vent and clear times.
As with the tempered glass with daylight film, no glass shards remained in the frame after
the break.
Figure 8: Test 26
Laminated Single
Paned Tempered Glass
7.5.
Laminated Insulating Glass Units
First break for the laminated annealed insulating glass units was approximately twice that
of the first break time for the single-paned laminated annealed insulating glass units.
The firefighters found that a good way to gain access through insulting glass units was to
first ensure that the non-laminated annealed panes were fully broken before addressing
the laminated panes. This allowed them to exploit the same flexible-mass effect they had
observed during the single-paned laminated glass demonstrations.
Figure 9: Laminated
Annealed Insulating
Glass Unit
7.6.
Second-Floor Attack
Firefighters were unable to break the windows on the second floor using a commonly
employed standard operating procedure, namely, breaking the glass with the tip of a roof
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