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  2. Sound attenuator - Wikipedia

    en.wikipedia.org/wiki/Sound_attenuator

    A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

  3. Michigan football staffer to remain after verbal altercation ...

    www.aol.com/michigan-football-staffer-remain...

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  4. Air handler - Wikipedia

    en.wikipedia.org/wiki/Air_handler

    Air flow control (CAV or VAV air handlers) Zone control (single zone or multi zone air handlers) Fan location (draw-through or blow-through) Direction of outlet air flow (front, up, or down) Package model (horizontal or vertical) But, the first method is very usual in HVAC market. In fact, most of the company advertise their products by air ...

  5. After Michigan staffer threatened Washington fans during loss ...

    www.aol.com/sports/michigan-staffer-threatened...

    In a video that’s been widely shared on social media, Michigan director of high school relations Chris Bryant went up to the stands on the Michigan sidelined and told fans to “chill the f ...

  6. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    The wavelength in air of sinusoidal noise at approximately 800 Hz is double the distance of the average person's left ear to the right ear; [1] such a noise coming directly from the front will be easily reduced by an active system but coming from the side will tend to cancel at one ear while being reinforced at the other, making the noise ...

  7. Unplug These Appliances That Hike Up Your Electricity Bill - AOL

    www.aol.com/finance/unplug-appliances-hike...

    If you keep your furnace fan running throughout the year, it could add $310 to your electricity bill. Unplug your furnace during the summer if you can. If it's hardwired, be sure to switch it off.

  8. Forced-air - Wikipedia

    en.wikipedia.org/wiki/Forced-air

    The supply plenum directs air from the central unit to the rooms which the system is designed to heat. Regardless of type, all air handlers consist of an air filter, blower, heat exchanger/element/coil, and various controls. Like any other kind of central heating system, thermostats are used to control forced air heating systems.

  9. Lennox International - Wikipedia

    en.wikipedia.org/wiki/Lennox_International

    Lennox International Inc. is a provider of climate control products for the heating, ventilation, air conditioning, (in the complex colloquially called: HVAC) and refrigeration markets. The company is based outside Dallas, Texas in the United States and has operations globally.