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Rated fire doors are tested to withstand an ASTM E119 standard time-temperature curve for a specified period. [8] There are 20, 30, 45, 60, and 90-minute-rated fire doors that are certified by an approved laboratory designated as a Nationally Recognized Testing Laboratory (NRTL, e.g., Underwriters Laboratories).
Other sizes sold are 45, 60 & 75 minute cylinders. The cylinder and valve assembly is used for storing breathable air under pressure. Dimensions: a. Cylinder = 19.6” × 5” b. Water capacity = 285 cubic inches c. Air capacity = 45 cubic feet (1,280 L) for a 30-minute air supply [2] (1274 liters) d. Weight = 11 pounds (5.0 kg) e.
The endurance of the cylinder can be calculated from the volume, pressure and breathing rate of the user. The formula: volume (in liters) × pressure (in bars) / 40 (litres per minute) - 10 minutes (the 10 minutes is a safety margin, or reserve), so a 6-liter cylinder, of 300 bar, is 6 × 300 / 40 - 10 = 35 minutes working duration.
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This rating is the requirement in data safes and vault structures for protecting digital information on magnetic media or hard drives. Temperatures inside the protected chamber must be held below 125 °F (52 °C) for the time period specified, such as Class 125-2 Hour, with temperatures up to 2,000 °F (1,090 °C) outside the vault.
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