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2. Plenum space - Wikipedia

   en.wikipedia.org/wiki/Plenum_space

   In the event of a fire, this can expose non-fire resistant building materials to heat. 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.

3. Plenum cable - Wikipedia

   en.wikipedia.org/wiki/Plenum_cable

   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.

4. Trace heating - Wikipedia

   en.wikipedia.org/wiki/Trace_heating

   Trace heating may be used to protect pipes from freezing, to maintain a constant flow temperature in hot water systems, or to maintain process temperatures for piping that must transport substances that solidify at ambient temperatures. Electric trace heating cables are an alternative to steam trace heating where steam is unavailable or ...

5. R-value (insulation) - Wikipedia

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

   Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]

6. Heating film - Wikipedia

   en.wikipedia.org/wiki/Heating_film

   The films can also be used in heating panels to produce wall or ceiling panel heaters. Although heating films do not usually run at very high temperatures (typically 30 °C (86 °F) on floors and up to 40 °C (104 °F) on walls), due to the large surface area they cover, they can provide significant energy output.

7. Underfloor air distribution - Wikipedia

   en.wikipedia.org/wiki/Underfloor_air_distribution

   The UFAD system was originally introduced in the 1950s for rooms with high heat loads and raised floors systems for cable and equipment management (e.g. computer rooms, control centers, etc.). The system was introduced into office buildings in the 1970s in West Germany, with the addition of occupant-controlled localized supply diffusers.