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What is supposed to be the length of duct liner to be installed inside duct from machine for both supply and return side?

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Question ajoutée par adnan akhter , Project QA/QC Engineer , Radiant (UCC Qatar)
Date de publication: 2016/12/14
Sherif Mohammed Ibrahim
par Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company

actually length of duct liner depend on the sound analysis, and how much sound damping we need so for analysis you will find the next variants:

- equipment size and selection, and sound data from manufacture.

- sound pass analysis.

- size of ducts and insulation.

- type of space and interiors.

anyway it is complicated process, as a maximum and minimum you can consider 3 m length minimum and 10 m length maximum these values obtained from previous projects data.

Abdul Moqeem Mohammed
par Abdul Moqeem Mohammed , Manager , KSA

Both in supply and return of AHU or FAHU, the  Acoustic treatment/insulation shall be min3 meters internal duct lining1" thickKg/cubic meter density acoustic lining required from the mouth of the unit till the max meters. However in the machines like FCUs or package units where the Acoustic lining are to be provided up to1.2 meters or till1st outlet/inlet.

ijaz ijaz
par ijaz ijaz , Engineering services supervisor , Pakistan Tobacco Company limited

Both in supply and return.

For AHUs shall be 3 meters internal duct lining 1" thick 48Kg/cubic meter density acoustic lining required from the mouth of the unit. Both in supply and return.

Anirban Dutta
par Anirban Dutta , Project Engineer and Manager of Design Services , Arabi enertec KSCC WLL

You can consider 3 m length minimum and 10 m length maximum for any unit to reduce the noise level in the duct

chetan sharma
par chetan sharma , Senior project engineer , trinity engineering services

thumb rule 2 mt rs for FCU and 3 to 5 meter for AHU,

for sounds which are beyond the audible limit restricted to the NC level in side the specific space you need to calculate the length required,Many cases you would require to use sound attenuator to damp the sound.

In order to calculate this you would require the duct size the machine technical detail for sound and the last point or diffuser and the distance of listener from it .

 

 

hussain fasahat
par hussain fasahat , Site Engineer , Fajr Al najah technical services llc

3m for supply and for return i think no need

Haitham El shinnawy
par Haitham El shinnawy , Head of Mechanical Engineering Department , Universal Contracting Company-Unico

First of all, you have to make sound analysis for your duct work. Then, you decide to go for duct lining or sound attenuater to eliminate machine sound. In case sound attenuater unit being costly, you can use up to 3 meters of lining for both supply and return ducts. 

Martin Thomas vaz
par Martin Thomas vaz , Senior Mechanical Engineer- Supervision consultant , ALKASHAF INTERNATIONAL-DESIGN AND ENGINEERING CONSULTANCY

Simple thumb rule to be followed, for FCUs 1.5 meters internal duct lining 1/2" thick 32 Kg/cubic meter density acoustic lining required from the mouth of the unit. Both in supply and return.

For AHUs shall be 3 meters internal duct lining 1" thick 48Kg/cubic meter density acoustic lining required from the mouth of the unit. Both in supply and return.

Muhammad Ehsan
par Muhammad Ehsan , Construction Manager Mechanical , IZHAR Group

In Supply and return air duct  sound liner length must be 15 to 20 Rft 

NASAR MOIN KHAN   PMP®
par NASAR MOIN KHAN PMP® , MECHANICAL SUPERINTENDENT , SATCO

ALL MAIN SUPPLY AND RETURN AIR DUCTS SHALL BE INTERNALLY LINED WITH ACOUSTICAL INNER LINER  FROM THE A/C   UNIT TO THE FIRST AIR OUTLET OR INLET.

Javedkhan Pathan
par Javedkhan Pathan , Supervisor , Asqaam Engineering

It would be 15 to 20 ft depending upon the situation of the site.

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