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I ripped a whole bedroom to bits and packed rockwool into every wall cavity,
put 2 layers of 4' into the floor and the same in the roof
didn't do any good, I could still hear my kids kicking the shit out of a drum kit upstairs
mind you it was my own fault for building a recording studio in there bedroom
then buying them guitars & drum kits for birthdays & xmas
buy a quiet fan less hassle and cheaper in the long run
sound damp board is expensive and a lot of work to get into place
Like a silencer on a gun, the noise is captured inside and energy dissipated before it gets to the end. Use a trash can with a hole cut in the bottom and line loosely with fiberglass. Use wire cage to hold open center hole and plug your exhaust to bottom.
The whine becomes a whoosh!
white styrofoam, like coffecups, make decent sound insulation, cut holes in a box, put fan inside, load with shipping peanuts, pack tight but dont crush, make sure to have foam underneath also, if no styrofoam use straw and cloth.
My 2 dracmas, cents, pesos, whatever you use over there! hehe
Old Mate showed us some bathroom extractor fans that worked great and were not any notice-able then any other. Best of Luck to you in your Quest for Silence.
this is what i bought the other week to put on the input side of the rvk fan is helped but needs more so am building a acoustic box for the fan and al put more insulated duct on the output to finish it http://www.icmag.com/ic/picture.php?albumid=8769&pictureid=171696
same this end bud, SonoDuct acoustic ducting is the brand we have here, approx 3m of it
what size is your RVK rocket high?
we have RVKs here too, 2 x RVK150-A1s with a CF360 filter connected by the ducting I mentioned
I've currently got BOG's BMR (good to see him back in action!) on the go, amongst a couple of other smelly strains and they def make a noticeable difference
Don't think I have any pics in my gallery although there may be one or two of the BMR in my album?