Excellent manufacturers, galvanized plate muffler [plenum], Suihua muffler plenum provided by Horizon Air conditioning equipment. We are a Texas Air Conditioning Equipment Co., Ltd. Hongxin (www.hxktsb.com) located at: Shandong Dezhou specializes in: New air unit fresh air ventilator fan air pressure delivery outlet damper chassis outlet 1, the static pressure in the design .. When box, if the wind speed according to the design requirements, will be a great box; General plenum long side to side width of duct 400mm, height to width of the duct height 400mm. (Tear1111) According yunflame Secret: tear1111 values ??are to engage in York from the plenum chamber muffler design manual, it is estimated. 2, the general experience plenum old engineer is 5 ~ 10db (a) / m anechoic plenum, complex impedance (air conditioning and ventilation systems in general seem to have used this) muffler 10 ~ 15db (a) / m (flyforme- bj) silencer plenum static pressure played a role in the increase. Muffler muffler is a role not only allow airflow through the plenum chamber muffler galvanized sheet, can effectively prevent or attenuate acoustic devices can spread outward. Anechoic plenum is generally used in the vicinity of the outlet of the more common fan. But why have the suction fan is mounted to the nearby port, it is also serve to reduce wind effect. High wind suction fan, air is also large impact on the impeller. In addition, the role of the muffler name implies. And plenum chamber are two completely different parts.