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  2. Attic ladder - Wikipedia

    en.wikipedia.org/wiki/Attic_ladder

    An attic ladder (US) or loft ladder (UK) is a retractable ladder that is installed into an attic door/access panel. They are used as an inexpensive and compact alternative to having a stairway that ascends to the attic of a building. They are useful in areas with space constraints that would hinder the installation of a standard staircase.

  3. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    In the case of materials, it is often expressed in terms of R-value per metre. R-values are additive for layers of materials, and the higher the R-value the better the performance. The U-factor or U-value is the overall heat transfer coefficient and can be found by taking the inverse of the R-value. It is a property that describes how well ...

  4. Fixed ladder - Wikipedia

    en.wikipedia.org/wiki/Fixed_ladder

    Fall protection system: Fixed ladders above 24' must have a fall protection system in accordance with OSHA Standard 1910.28(b)(9)(i)(C). Cages are not anymore considered as fall protection, and ladders that are newly installed or replaced after November 19, 2018, must have a fall protection system based on OSHA's new fixed ladder requirements.

  5. List of New York City Subway R-type contracts - Wikipedia

    en.wikipedia.org/wiki/List_of_New_York_City...

    New car design – auxiliary systems R110A: Prototype new technology passenger cars 8001–8010 Kawasaki 1992 Retired, 6 in work service, 4 pending work service R110B: Prototype new technology passenger cars 3001–3009 Bombardier Transportation 1992 Retired, 3001/3004–3006/3008 used for training R111 Funding/purchasing 2 cranes R112

  6. New York City Subway rolling stock - Wikipedia

    en.wikipedia.org/wiki/New_York_City_Subway...

    The New York City Subway is a large rapid transit system and has a large fleet of electric multiple unit rolling stock. As of September 2024, the New York City Subway has 6712 cars on the roster. The system maintains two separate fleets of passenger cars: one for the A Division (numbered) routes, the other for the B Division (lettered) routes ...

  7. Loft - Wikipedia

    en.wikipedia.org/wiki/Loft

    In US usage, a loft is an upper room or storey in a building, mainly in a barn, directly under the roof, used for storage (as in most private houses).In this sense it is roughly synonymous with attic, the major difference being that an attic typically constitutes an entire floor of the building, while a loft covers only a few rooms, leaving one or more sides open to the lower floor.

  8. Cellulose insulation - Wikipedia

    en.wikipedia.org/wiki/Cellulose_insulation

    Due to complaints by retailers, contractors and consumers about price, safety and quality control problems, the U.S. federal government began enacting insulation standards beginning in 1978. There was a great concern that the growth in cellulose manufactures was leading to improperly or insufficiently treating insulation against the threat of ...

  9. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    An extension ladder. A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.

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