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  2. Octagon house - Wikipedia

    en.wikipedia.org/wiki/Octagon_house

    The plan is a 50-foot (15 m) octagon, with a 4-foot-8-inch (1.42 m) veranda all round at first- and second-floor levels. The house is built on 17-inch-thick (430 mm) stone foundations, with external walls of brickwork 13 inches (330 mm) thick. The central square is made up of two 4-inch (100 mm) leaves of brickwork with a 4-inch (100 mm) cavity ...

  3. Underfloor air distribution - Wikipedia

    en.wikipedia.org/wiki/Underfloor_air_distribution

    The most common UFAD configuration consists of a central air handling unit delivering air through a pressurized plenum and into the space through floor diffusers. Other approaches may incorporate fan powered terminal units at the outlets, underfloor ducts, desktop vents or connections to Personal Environmental Control Systems. [8]

  4. Duct (flow) - Wikipedia

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

    For ease of handling, it most often comes in 4' (120 cm) sections (or joints). 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 ...

  5. Displacement ventilation - Wikipedia

    en.wikipedia.org/wiki/Displacement_ventilation

    Displacement ventilation is best suited for taller spaces (higher than 3 meters [10 feet]). [2] Standard mixing ventilation may be better suited for smaller spaces where air quality is not as great a concern, such as single-occupant offices, and where the room height is not tall (e.g., lower than 2.3 meters [7.5 feet]).

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  7. Chimney - Wikipedia

    en.wikipedia.org/wiki/Chimney

    Combining two flows into chimney: A t +A f <A, where A t =7.1 inch 2 is the minimum required flow area from water heater tank and A f =19.6 inch 2 is the minimum flow area from a furnace of a central heating system.

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