Augustasstr Posted February 17, 2022 Share Posted February 17, 2022 Hello, I am in process of designing my MHRS and can not decide between size and quantity of the semirigid ducts. As I understand it mainly depends on velocity of air, lower velocity = less noise. What velocity would you recommend? Some sources say that in normal operation it should be below 2.5m/s others say that below 4m/s. Thanks in advance. Link to comment Share on other sites More sharing options...
Nickfromwales Posted February 17, 2022 Share Posted February 17, 2022 1 hour ago, Augustasstr said: Hello, I am in process of designing my MHRS and can not decide between size and quantity of the semirigid ducts. As I understand it mainly depends on velocity of air, lower velocity = less noise. What velocity would you recommend? Some sources say that in normal operation it should be below 2.5m/s others say that below 4m/s. Thanks in advance. Why not get a basic design done, and then work out the difference it would make when upping from one duct to a valve to two ducts. I always double up on longer runs to bedrooms or living spaces regardless to reduce the audibility, and also fit attenuators ( silencers ) between the MVHR unit and the manifolds for belt and 3 braces. Link to comment Share on other sites More sharing options...
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