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Plenum cable / ˈ p l ɛ n əm / is electrical cable that is laid in the plenum spaces of buildings. In the United States , plastics used in the construction of plenum cable are regulated under the National Fire Protection Association standard NFPA 90A: Standard for the Installation of Air Conditioning and Ventilating Systems.
Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...
A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.
The 282 cu in (4.6 L) engine underwent engineering upgrades that included an all-new head design with an improved cooling system and quench-type combustion chambers, a higher 8.0:1 compression ratio, and a new two-barrel aluminum intake manifold, while the rear differential gear ratio changed from 3.31:1 to 3.07:1.
The estimated cost of the project rose over threefold from US$3.5 billion to US$11.1 billion as of April 2018, making it one of the world's most expensive underground rail-construction projects. The new LIRR terminal contains eight tracks and four platforms in a two-level station 100 feet (30.5 m) below street level.
The AMC Spirit is a subcompact car sold by American Motors Corporation (AMC) from 1979 through 1983. Replacing the AMC Gremlin, the Spirit was available in two different body styles, both were two-door hatchbacks – but neither was marketed as such.