general
	Post Reply		Forum

Replies to this message

Re: general
Re: general -- aliasgar	Post Reply	Top of thread	Forum

Posted by: randykimball ® 05/22/2005, 20:37:11 Author Profile Mail author Edit

If you need to pass large amounts of air and block several Db of noise, muli-layers of reversed direction louvers with ample space between them is quite effective. The space between them will need to be adjusted to suit the wave lengths of the sound pollution. For smaller amounts of air (for example pressure equalization) and several Db of noise, mineral wool enclosed in steel perf-sheet works. The idea here is to bounce the sound in different directions around in a chamber until it is trapped in the wool. This also will work as a duct shape with the air flowing on thru as long as you force the air flow to change speeds and direction a few times while passing thru an area surrounded by perf-steel walls lined with the proper density of mineral wool. The perf-steel sheet allows the noise to get into the wool and be trapped. This is standard proceedure in large airconditioning units, or around machinery. Remember to allow for a pressure drop caused by the speed and direction changes. -randy- The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. Modified by randykimball at Sun, May 22, 2005, 23:14:47

Post Reply | Recommend | Alert

Where am I? Original Top of thread

Re: general
Re: general -- aliasgar	Post Reply	Top of thread	Forum

Posted by: Cragyon ® 05/21/2005, 22:52:41 Author Profile Mail author Edit

Some forms of open cell foam will reduce the amount of sound passing through it and allow air to flow.

Post Reply | Recommend | Alert

Where am I? Original Top of thread

| |