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2. Bed size - Wikipedia

   en.wikipedia.org/wiki/Bed_size

   The sizes of mattresses use non-numeric labels such as a "king" or "full", but are defined in inches. ... Size Dimensions Inches Centimeters Crib 27.5 × 52 70 × 132 ...

3. Sheet pan - Wikipedia

   en.wikipedia.org/wiki/Sheet_pan

   In American sizing, the full-size sheet pan is 26 in × 18 in (660 mm × 460 mm), which is too large for most home ovens. [1] A two-thirds sheet pan (also referred to as a three quarter size sheet pan) is 21 in × 15 in (530 mm × 380 mm).

4. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

5. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   There is little evidence that the dimensions of these early racks were standardized. Telephone equipment racks (1923) The 19-inch rack format with rack-units of 1.75 inches (44.45 mm) was established as a standard by AT&T around 1922 in order to reduce the space required for repeater and termination equipment in a telephone company central office .

6. ATX - Wikipedia

   en.wikipedia.org/wiki/ATX

   Other standards for smaller boards (including microATX, FlexATX, nano-ITX, and mini-ITX) usually keep the basic rear layout but reduce the size of the board and the number of expansion slots. Dimensions of a full-size ATX board are 12 × 9.6 in (305 × 244 mm), which allows many ATX chassis to accept microATX boards. The ATX specifications were ...

7. Drive bay - Wikipedia

   en.wikipedia.org/wiki/Drive_bay

   Full-height bays were found in old PCs in the early to mid-1980s. They were 3 + 1 ⁄ 4 inches (82.6 mm) high, 5 + 3 ⁄ 4 inches (146.1 mm) wide, and up to 8 inches (203.2 mm) deep, used mainly for hard disk drives and floppy disk drives. This is the size of the internal (screwed) part of the bay, as the front side is actually 5 + 7 ⁄ 8 ...