适用范围主要用于降低各种系列（8-18型.9-27型）的高压离心风机的风口、风道和封闭式机房进风口的空气动力性噪声，也可供锅炉引风机、鼓风机消声降噪。根据使用要求不同，分为A、B型两种，A型两端均为法兰盘，直接串接于管道中，B型一端为防雨风帽，仅供设置在室外管道末端和封闭式机房进风口选用。消声量25dB(A),压力损失<300Pa。规格选用表序号法兰内径D(mm)外形尺寸（mm）有效长度L(mm)风量(m3/h)外径D安装长度L1A型B型A型B型1230450150015001100135020002340600160016001200145050003420730175017501300160080004500790180018001350165012000558090019001930145017801600066509501950203015001880200007700100021002230165020802500087801100215023001680215030000984011802200238017202200350001090013302300245017502250400001110001420235025501800235050000)