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NFPA 80 allows a maximum door undercut of 3/4 inch, however fire doors are tested with smaller clearances in accordance with NFPA 252. Corridors have a fire rating of one hour or less, and the fire doors in them are required by code to have a fire rating of 1/2 or 1/3 hour, the intent of which is mainly to restrict smoke travel.
Under United States building codes, the stairwell of a smokeproof enclosure must have walls with a 2-hour fire resistance rating and vestibule doors (if provided) with a 1.5 hour fire resistance rating.
The P-61 radar operator occupied a separate compartment in the rear of the fuselage accessed from a hatch below. In August 1940, sixteen months before the United States entered the war, the U.S. Air Officer in London, Lieutenant General Delos C. Emmons, was briefed on British research in radar ("Radio Detection And Ranging" as it was then known), which had been underway since 1935, and had ...
The new movie is enormously popular, but it's not a great film. Instead, it's a masterpiece of cinematic marketing. The Barbie movie is a 2-hour Mattel commercial [Video]
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A Buffalo, New York, grocery store reopened two months after a gunman killed 10 Black people in 2022. A Boulder, Colorado, supermarket where 10 were killed in 2021 reopened nearly a year later ...
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Canon Eos Camera. $500 $600 Save $100. Your iPhone camera is great and all, but there’s nothing like a high-quality digital camera to capture the important moments in your life. With a 24.1 ...