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  2. Lintel - Wikipedia

    en.wikipedia.org/wiki/Lintel

    Modern-day lintels may be made using prestressed concrete and are also referred to as beams in beam-and-block slabs or as ribs in rib-and-block slabs. These prestressed concrete lintels and blocks can serve as components that are packed together and propped to form a suspended-floor concrete slab. An arch functions as a curved lintel. [1] [2]

  3. Fireplace - Wikipedia

    en.wikipedia.org/wiki/Fireplace

    Fireplace with tubular grate heater, with a high surface area in its heat exchanger and a lift out ash tray to simplify cleanup Some fireplace units incorporate a blower, which transfers more of the fireplace's heat to the air via convection , resulting in a more evenly heated space and a lower heating load.

  4. Hollow-core slab - Wikipedia

    en.wikipedia.org/wiki/Hollow-core_slab

    The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3–3/4 the thickness of the slab. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. The reduced weight also lowers material and transportation costs.

  5. Weld access hole - Wikipedia

    en.wikipedia.org/wiki/Weld_access_hole

    The weld access hole or rat hole is a structural engineering technique in which a part of the web of an I-beam or T-beam is cut out at the end or ends of the beam. The hole in the web allows a welder to weld the flange to another part of the structure with a continuous weld the full width on both top and bottom sides of the flange.

  6. Chimney - Wikipedia

    en.wikipedia.org/wiki/Chimney

    Flue liners may be clay or concrete tile, metal, or poured in place concrete. Clay tile flue liners are very common in the United States, although it is the only liner that does not meet Underwriters Laboratories 1777 approval and frequently they have problems such as cracked tiles and improper installation. [ 7 ]

  7. Fire drill - Wikipedia

    en.wikipedia.org/wiki/Fire_drill

    A group of students at James Madison University evacuate their dorm rooms in response to a fire drill. The purpose of fire drills in buildings is to ensure that everyone knows how to exit safely as quickly as possible if a fire, smoke, carbon monoxide, or other emergency occurs, and to familiarize building occupants with the sound of the fire alarm.

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