... blowers are of better quality,performance and after-sale services.Less vibraion and lower noise. AIR Roots Blowerstwin-lobe ... HT20013. Shell: HT20014. QT450 wall plate:HT20015. Accessories: inlet filter, outlet silencer, expansion joint, check valve, foundation bolts, ... enterprises for roots blowers and paper processing machineries, with two-decade-plus experience of design, fabrication technique, and ...