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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. Transmission loss (duct acoustics) - Wikipedia

   en.wikipedia.org/wiki/Transmission_Loss_(duct...

   Transmission loss (TL) in duct acoustics describes the acoustic performances of a muffler-like system.It is frequently used in the industry areas such as muffler manufacturers and NVH (noise, vibration and harshness) department of automobile manufacturers, and in academic studies.

4. Glasspack - Wikipedia

   en.wikipedia.org/wiki/Glasspack

   The glasspack is an old, simple, and relatively inexpensive muffler design that has less back pressure than other types of muffler, but is less effective at muffling noise. A longer glasspack will reduce noise to a greater extent than a shorter one, as sound is dissipated into the fiberglass damping material.

5. My System for Making Sure I Do What Matters

   images.huffingtonpost.com/2013-02-02-MySystemfor...

   My#System#for#Making#Sure#I#Do#What#Matters# #! With!all!the!devices!we!use!on!a!daily!basis,!I!still!like!to!make!my!to7do!lists!with!pen!to! paper!!!I!find!it!is ...

6. Muffler - Wikipedia

   en.wikipedia.org/wiki/Muffler

   Silencer (silver) and exhaust pipe on a Ducati motorcycle A silencer cut open to show the insulation, chambers and piping inside the shell. A muffler (North American and Australian English) [1] or silencer (British English) is a device for reducing the noise emitted by the exhaust of an internal combustion engine—especially a noise-deadening device forming part of the exhaust system of an ...

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