Duct Sound Attenuator Selection

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Duct sound attenuator selection.

Since attenuation values are generally higher in the first five octave bands in the reverse flow mode compared to the forward flow mode more economical silencer selections can often be made on return air systems. Noise and attenuation noise is usually defined as unwanted sound noise noise generation silencers and attenuation in hvac systems. If the sound levels are not met the program will automatically chooses a duct silencer for you based on your allowable height width and length and pressure loss. Attenuator selection procedure low freq bias noise db overall level attenuator attenuator loss db after db overall level 63hz 75 76 8 4 71 72 0 125hz 70 6 64 125hz 65 9 56 500hz 60 10 50 1000hz 60 15 45 2000hz 60 13 47 4000hz 55 14 41 8000hz 50 12 38 attenuator noise level reduction 4 9db high freq bias noise db overall level attenuator loss db.

The pack less design of these units makes them equally suitable to the types of systems mentioned for the rectangular pack less attenuators. Circular pack less attenuators are excellent for small diameter circular duct systems such as fume hoods. Hvac systems heating ventilation and air conditioning systems. The simple design relatively low cost and high level of performance flexibility make rectangular silencers a reliable and cost effective choice.

Find lindab s ventilation products. It is a true model all program. In 1972 iac developed silencer dynamic insertion loss and self noise ratings both under forward flow and reverse flow conditions for rectangular and cylindrical duct attenuators. Duct silencer selection tool.

Ruskin has a complete line of acoustical products as well as the experience and knowledge to design products for special conditions. Sound attenuators in ventilation ductwork are installed near sources that generating. Ventilation silencers for air duct systems product selection guide what is the function of sound attenuator. Calculate diffusers chilled beams dampers silencers fans ducts leakage.

Duct silencers are also referred to as sound attenuators sound traps or mufflers. A duct silencer is a component of ventilation system used to reduce noise transmitted inside ventilation ductwork. Acoustics room acoustics and acoustic properties decibel a b and c noise rating nr curves sound transmission sound pressure sound intensity and sound attenuation. In duct swl db 63 250 500 1000 2000 4000 8000125 0 20 40 60 80 octave frequency hz befor e atten u ator aft e r att enua to r generator attenuator noise before attenuator noise after attenuator 76 8 db 72 0 db attenuator noise level reduction 4 9db to mmake aan aattenuator sselection tthat wwill pprovide ssatisfactory pperformance.

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