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
The Eco-Throttle also aids in the sound attenuation
, as does a newly designed rigid frame, Honda said.
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.
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.