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  2. Sound attenuator - Wikipedia

    en.wikipedia.org/wiki/Sound_attenuator

    An inner perforated layer of light gauge sheet metal (baffle) The baffle is then filled with sound-absorptive insulation In high velocity systems, or when there is a concern for particulate matter in the air stream, a bagged or mylar-faced insulation is used. Packless sound attenuators do not include sound-absorptive insulation.

  3. Baffle (heat transfer) - Wikipedia

    en.wikipedia.org/wiki/Baffle_(heat_transfer)

    Cross-sectional diagram of stirred tank reactor. Baffles are flow-directing or obstructing vanes or panels used to direct a flow of liquid or gas. It is used in some household stoves [1] and in some industrial process vessels (tanks), such as shell and tube heat exchangers, chemical reactors, and static mixers.

  4. Cellulose insulation - Wikipedia

    en.wikipedia.org/wiki/Cellulose_insulation

    Many types of cellulosic materials have been used, including newspaper, cardboard, cotton, straw, sawdust, hemp and corncob. Modern cellulose insulation, made with recycled newspaper using grinding and dust-removing machines and adding a fire retardant, began in the 1950s and came into general use in the United States in the 1970s.

  5. Building insulation material - Wikipedia

    en.wikipedia.org/wiki/Building_insulation_material

    Rigid panel insulation, also known as continuous insulation [15] can be made from foam plastics such as polyisocyanurate or polystyrene, or from fibrous materials such as fiberglass, rock and slag wool. Rigid panel continuous insulation is often used to provide a thermal break in the building envelope, thus reducing thermal bridging.

  6. Johns Manville - Wikipedia

    en.wikipedia.org/wiki/Johns_Manville

    At the age of 21, Henry Ward Johns had already patented roofing and insulation products. In 1858, he founded the H.W. Johns Manufacturing Company in New York City . [ 3 ] [ 4 ] In 1885, the Manville Covering Company was established in Wisconsin by Charles B. Manville, whose grandson was the much-married socialite Tommy Manville .

  7. Sound baffle - Wikipedia

    en.wikipedia.org/wiki/Sound_baffle

    Sound baffles are also used in speaker cabinets to absorb energy from the pressure created by the speakers, thus reducing cabinet resonance. In 1973, Pearl P. Randolph, a school bus driver in Virginia, won a new school bus in a national contest held by Wayne Corporation for the suggestion that sound baffles be installed in the ceiling of school ...

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