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  2. Rebar spacer - Wikipedia

    en.wikipedia.org/wiki/Rebar_spacer

    The rebar spacers are fixed before the concrete is poured and remain within the structure. The main categories of rebar spacers are: Linear Spacers (Section profiles, H-section profiles, or 3-dimensional shapes), Point Spacers (wheel spacers, various tower or chair-like shapes) Rebar spacers can be divided into three raw materials categories:

  3. Prefabrication - Wikipedia

    en.wikipedia.org/wiki/Prefabrication

    The quality of prefabricated housing units had increased to the point that they may not be distinguishable from traditionally built units to those that live in them. The technique is also used in office blocks, warehouses and factory buildings. Prefabricated steel and glass sections are widely used for the exterior of large buildings.

  4. Duct (flow) - Wikipedia

    en.wikipedia.org/wiki/Duct_(flow)

    Round duct is made using a continuous spiral forming machine which can make round duct in nearly any diameter when using the right forming die and to any length to suit, but the most common stock sizes range evenly from 4" to 24" (10-60 cm) with 6"-12" (15-30 cm) being most commonly used. Stock pipe is usually sold in 10' (300 cm) joints.

  5. Dropped ceiling - Wikipedia

    en.wikipedia.org/wiki/Dropped_ceiling

    Dropped ceiling featuring ceiling tiles, lights, air diffusers, smoke detector, and more Dropped ceiling with ceiling tile light fixture. A dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling.

  6. Duct - Wikipedia

    en.wikipedia.org/wiki/Duct

    The word duct is derived from the Latin word for led/leading. It may refer to: Duct (anatomy), various ducts in anatomy and physiology Tear duct, which carry tears to the eyes; Duct (HVAC), for transfer of air between spaces in a structure; Duct tape, a kind of adhesive tape; Ducted fan, motor for aircraft; Electrical bus duct, a metal ...

  7. Prefabs in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Prefabs_in_the_United_Kingdom

    The Excalibur estate in Catford, London Borough of Lewisham is the UK's largest remaining estate of post-WW2 prefab houses, with 187 Uni-Seco wooden frame bungalows plus a flat-roofed prefab church. While residents fought to save the entire 187-unit estate, English Heritage wanted to save 21 examples, and the council, which still owns 80% of ...