Breathing Buildings’ acoustic attenuation solutions are designed to meet BB93 regulations or schools, and BS8233 code o practice or other building types. Each acoustic solution can be adapted to be site and building specic. On the fight path At Barneld South Academy in Luton, the new building is underneath the fight path o Luton Airport and immediately adjacent to the M1 motorway. BB was required to provide a high perormance ventilating element o R w 25dB, to reduce noise break-in and meet the ambient noise level (35dB L Aeq) . The challenge was to meet the acoustic requirements while maintaining a low pressure drop across the attenuator or eective ventilation. The system was designed such that most o the ventilation was carried out through the roo mounted units, although windows can be opened in particularly hot conditions. The attenuation solution included an 1000x1500x900mm attenuator within each o the roo terminations or the R-series units. The attenuator consists o a series o bafes, constructed rom steel mesh and lled with a mineral wool o varying densities designed to absorb di erent requencies o sound. Some projects require acoustic attenuation in order to successully employ natural ventilation. This is oten the case on particularly noisy sites where break-in noise becomes an issue, or when preventing cross-talk between spaces. Acoustic Attenuation Issue 1.3 / Oct 10 Breathing Buildings Ltd. Registered in England and Wales. Registered Oce: The Courtyard, 15 Sturton Street, Cambridge, CB1 2SN. Registered No. 05676785 University o Hertordshire attenuated roo terminal For More Inormation Contact Breathing Buildings at: Breathing Buildings The Courtyard, 15 Sturton Street, Cambridge CB1 2SN Tel: +44 (0) 1223 450 060 Fax: +44 (0) 1223 450 061 Email: in[email protected] Web: www.breathingbuildings.com Roof Terminal Assembly constructed from extruded aluminium sections. Acoustic attenuator Constructed of 6 baffles @ 900mm high. Ring Beam Hot dip galvanised welded steel fabrication. Order in the court Another example o acoustic attenuation provided by Breathing Buildings is at the University o Hertordshire Law School. Here acoustic attenuation is needed to reduce external break-in noise to the ull sized mock courtroom as well as the classrooms. Breathing Buildings designed a bespoke roo termination, incorporating an acoustic attenuator or the R-series units. The building also has attenuated low level dampers providing the air inlets, which Breathing Buildings incorporated into the system design. General assembly o roo terminal and attenuator as used at Barneld South Academy The lit at Barneld Roof Terminal (louvre removed for clarity) Ring Beam Attenuator Curb and slab Not e: Vertical solitter aligned with spl itt er in shaft

Acoustic Attenuation

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8/3/2019 Acoustic Attenuation

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Breathing Buildings’ acoustic attenuation solutions are designed to

meet BB93 regulations or schools, and BS8233 code o practice or

other building types. Each acoustic solution can be adapted to be

site and building specic.

On the fight path

At Barneld South Academy in Luton, the new building is underneath

the fight path o Luton Airport and immediately adjacent to the M1

motorway. BB was required to provide a high perormance ventilating

element o Rw25dB, to reduce noise break-in and meet the ambientnoise level (35dB L Aeq). The challenge was to meet the acoustic

requirements while maintaining a low pressure drop across the

attenuator or eective ventilation. The system was designed such that

most o the ventilation was carried out through the roo mounted units,

although windows can be opened in particularly hot conditions.

The attenuation solution included an 1000x1500x900mm attenuator

within each o the roo terminations or the R-series units. The

attenuator consists o a series o bafes, constructed rom steel mesh

and lled with a mineral wool o varying densities designed to absorb

dierent requencies o sound.

Some projects require acoustic attenuation in order to successully employnatural ventilation. This is oten the case on particularly noisy sites where break-in

noise becomes an issue, or when preventing cross-talk between spaces.

Acoustic Attenuation

Issue 1.3 / Oct 10 Breathing Buildings Ltd. Registered in England and Wales. Registered Oce: The Courtyard, 15 Sturton Street, Cambridge, CB1 2SN. Registered No. 05676785

University o Hertordshire

attenuated roo terminal

For More Inormation Contact

Breathing Buildings at:

Breathing Buildings

The Courtyard,

15 Sturton Street,

Cambridge CB1 2SN

Tel: +44 (0) 1223 450 060

Fax: +44 (0) 1223 450 061

Email: [email protected]

Web: www.breathingbuildings.com