Acoustic question

[remp]

I have a discharge plenum box form a large air handling unit lined with 50mm rockwool protected with a material sheet called Cleantec to stop the rockwool shedding (used in attenuators for clean room applications). I'd like to cover all this with perforated metal for maechanical prtection since the plenum box is accessable via access doorway. Will I loose much of the acoustic performace of the insulation if I do this?. What should the spec on the perf-metal be?

Regards
Billyq

 

[imok2]

billyq This may be of some help:

http://www.bradfordinsulation.com.a.../Internal_Insulation_of_Sheet_Metal_Ducts.pdf

 

[VEEKRISH]

You could use Perforated Aluminum Sheeting. Perforation to allow about 25% free area. Sheet could be 30 gauge Aluminum.