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Fire damper in oversized hole in a 2-hour rated concrete slab. Mechanical dampers obstruct the cross-sectional area of a HVAC duct in the event of a fire either by means of a pivoting a fire-resistant board in Europe, or steel shutters in North America.
For fully sprinkled buildings, the required rating is just one hour.) [4] The fans must be connected to an emergency power supply, and capable of both automatic activation by various fire and smoke detectors, and of manual activation by a central command post or by the actuation of a general fire alarm.
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Fire-resistance rated door, with wire mesh glass vision panel Industrial grade fire door rated to hydrocarbon curve and blast resistance Double fire door immediately after 3-hour fire test inside a 4-hour rated Durasteel wall Double fire door after 3-hour fire test in a 4-hour Durasteel wall, during successful 45PSI (3.1 bar) hose stream test leading to a UL Listing [1]
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The horizontal fire-tube boiler is also typical of marine applications, using the Scotch boiler; thus, these boilers are commonly referred to as "scotch-marine" or "marine" type boilers. [2] Vertical boilers have also been built of the multiple fire-tube type, although these are comparatively rare; most vertical boilers were either flued, or ...
This is the rating required to protect microfilm, microfiche, and other film-based information storage media. Above 150 °F (65.5 °C) film is distorted by the heat and information is lost. A Class 150-2 Hour vault must keep the temperature below 150 °F. for at least two hours, with temperatures up to 2,000 °F. (1,093.3 °C) outside the vault.
HCCS – horizontal clamp connection system; HCM – horizontal connection module (to connect the christmas tree to the manifold [citation needed]) HCS – high-capacity square mesh screens; HD – head; HDA – helideck assistant; HDD – horizontal directional drilling; HDPE – high-density polyethylene; HDT – high-resolution dipmeter log