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  2. Duct (flow) - Wikipedia

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

    Ducts for air pollution control in a 17000 standard cubic feet per minute regenerative thermal oxidizer (RTO). A round galvanized steel duct connecting to a typical diffuser Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic ...

  3. Underfloor air distribution - Wikipedia

    en.wikipedia.org/wiki/Underfloor_air_distribution

    Conventional overhead mixing systems usually locate both the supply and return air ducts at the ceiling level. Supply air is supplied at velocities higher than typically acceptable for human comfort and the air temperature may be lower, higher, or the same as desired room temperature depending on the cooling/heating load.

  4. Ductwork airtightness - Wikipedia

    en.wikipedia.org/wiki/Ductwork_airtightness

    The ductwork airtightness level is the airflow rate through ductwork leakages divided by the ductwork area. It is recommended to test at least 10% and 10 m 2 of the duct surface including all duct types and a variety of sizes and components. The ductwork surface area is estimated according to EN 14239. [11]

  5. Air-mixing plenum - Wikipedia

    en.wikipedia.org/wiki/Air-mixing_plenum

    Air streams are mixed to save energy and improve energy efficiency by partially recirculating conditioned air.. The most common application for an air-mixing plenum is the mixing of return air (or extract air) with fresh air to provide a supply air mixture for onward distribution to the building or area which the ventilation system is serving. [1]

  6. Goodman Global - Wikipedia

    en.wikipedia.org/wiki/Goodman_Global

    Goodman Manufacturing was founded by HVAC dealer, Harold V. Goodman, in 1975 as a manufacturer of flexible air ducts and plastic blade registers. However, he turned his sights to fulfill a dream of manufacturing affordable HVAC equipment for households across the United States of America and beyond. [citation needed]

  7. Diffuser (thermodynamics) - Wikipedia

    en.wikipedia.org/wiki/Diffuser_(thermodynamics)

    Ducts containing fluids flowing at low velocity can usually be analyzed using Bernoulli's principle. Analyzing ducts flowing at higher velocities with Mach numbers in excess of 0.3 usually require compressible flow relations. [2] A typical subsonic diffuser is a duct that increases in area in the direction of flow. As the area increases, fluid ...

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