by earplugs in the 1/3-octave-band with the 12.5 kHz centre frequency as a function of the catalogue H parameter by type of earplugs
* Dean's pioneering use of high velocity, low static pressure design using spiral duct plus his spearheading the development of low-frequency sound attenuation
were responsible for accelerating the growth of the use of large central systems for air conditioning in commercial buildings.
Each Permit filter/silencer is fully insulated to reduce heat loss and provide sound attenuation
Tenders are invited for work includes replace the existing ahu #1, #2 & mzu #3 indoor units including evaporator coils andoutdoor condensing units with new, energy efficient units of like configuration, and explorereplacing the existing unit setups with alternate solutions deploying energy efficient technologies that were unavailable when these units were initially deployed; engineer and install replacement equipment on a vibration isolation curb or equivalent manufacturer supported systems with sound attenuation
The Eco-Throttle also aids in the sound attenuation
, as does a newly designed rigid frame, Honda said.
The objectives of the contract also relate to the realization of works with respect to performances in terms of level of illumination, Sound attenuation
and air renewal.
Another mechanical property of the composite structure is a high level of sound attenuation
as the coupling incorporates a Gesilco disc, which consists of two flat membranes with flanges.
Many new special metal windows utilize insulated glass systems for enhanced thermal performance and sound attenuation
. Glazing options include tinted, low-E, tempered and laminated glass.
8,400 sf gross floor area includes act tiles and supporting framing, painting, steel stud partition, sound attenuation
batts and 5/8" gypsum board both sides.
The filter/ silencer package is housed in a 304 L stainless-steel shell and achieves a sound attenuation
of 27 to 35 dB(A), the company said.
To minimize noise levels, special sound attenuation
fittings were added to the cooling tower, which is also surrounded by an acoustically designed enclosure.
The project includes sound attenuation
improvements for certain residences around San Diego International Airport.