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A pet door (also known as a cat flap or dog door) is an opening in a door to allow pets to enter and exit without the main door's being opened. It may be simply covered by a rubber flap, or it may be an actual door hinged on the top that the pet can push through. Pet doors may be mounted in a sliding glass door as a new (permanent or temporary ...
A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [ 2 ] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [ 3 ]
The safe room should be adequately anchored to the foundation to resist overturning and uplift. The walls, ceiling, and door of the shelter should withstand wind pressure and resist penetration by wind-borne objects or falling debris. The connections between all parts of the safe room should be strong enough to resist separation by wind.
Closing your interior doors can help disperse pressure throughout the home and reduce the overall force stacked up against your roof -- basically your first line of defense against Mother Nature.
A United States Government Class 5-B vault door, which has been tested and approved by the Government under Fed. Spec. AA-D-600D, is ballistic resistant and affords the following security protection: 20 man-hours against surreptitious entry. 30 man-minutes against covert entry. 10 man-minutes against forced entry.
When the U.S. government began building bunkers and silos during the Cold War, Mosler became the contractor for blast doors. One set, installed at the Atomic Energy Commission 's Oak Ridge National Laboratory [ 3 ] : 47 in 1961, weighed approximately 65 tons per door, and were considered the heaviest doors installed in the United States at ...