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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. Air handler - Wikipedia

    en.wikipedia.org/wiki/Air_handler

    The attenuator is a specialty duct accessory that typically consists of an inner perforated baffle with sound-absorptive insulation. Sound attenuators may take the place of ductwork; conversely, inline attenuators are located close to the blower and have a bellmouth profile to minimize system effects.

  4. Attic fan - Wikipedia

    en.wikipedia.org/wiki/Attic_fan

    An attic fan installed underneath a roof. A powered attic ventilator, or attic fan, is a ventilation fan that regulates the heat level of a building's attic by exhausting hot air. A thermostat is used to automatically turn the fan off and on, while sometimes a manual switch is used. An attic fan can be gable mounted or roof mounted. Additional ...

  5. Baffle (heat transfer) - Wikipedia

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

    In this case the baffle helps increase the efficiency of the stove as more heat leaves the gas before it exits. The baffles prevent the rotational flow without affecting radial or longitudinal flow. The tank is provided with baffles which prevent swirling and vortex formation. Except in very large tanks, four(4) baffles are placed.

  6. Building envelope - Wikipedia

    en.wikipedia.org/wiki/Building_envelope

    The physical components of the envelope include the foundation, roof, walls, doors, windows, ceiling, and their related barriers and insulation. The dimensions, performance and compatibility of materials, fabrication process and details, connections and interactions are the main factors that determine the effectiveness and durability of the ...

  7. Spark arrestor - Wikipedia

    en.wikipedia.org/wiki/Spark_arrestor

    Centrifugal type spark arresters employ stationary vanes, baffles, or other devices to trap large particles by centrifugal force. These spark arresters are typically found on heavy agricultural and construction equipment (tractors, combines, bulldozers, etc.), but some have been developed for motorcycles and other all-terrain vehicles.

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