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I agree fiber glass for inside an accoustic box. Wear protective eye ware and a dust mask, gloves prefferably taped around the cuff and long sleeved clothing.
Fiber glass is a bitch you don't want to breathe it in or get it in your eyes or on your skin!!!
wrap fans in cling film/saran wrap.
Make a box large enough to put fan in plus extra space to fill with insulation, you will need a hole saw to make openings at the end for ducting to conect to the fan. My box is made from MDF ans is screwed and glued together leaving one end unglued for maintenance etc.
If vibration is a problem you can hang the box from ceiling joists using suit able eye screws bungees cord dampers and carabiners to clip from bungy loops to ceiling eyes.
IT would be like this screw eyes in top of acoustic box, thread through bungy cord (can be bought by the meter) and mke it so there is a double loop and secure the loo with zip ties (this works very well and doesn't come undone). You then clip a caribiner through the bungee loop and clip on to ceiling screw eyes, screwed in to the wooden joist (not the plaster!!)
My acoustic box is on top of my solid wooden construction cab so i use breeze blocks on top to stop any vibrations and is disguised with with carbord box so it looks like a box a tv came in.
Ducting can make a fair bit of noise especially if there are bends in it. Acoustic ducting certainly helps.
A fan silencer helps to stop the whooshing noise that comes out the end but it doesn't completely quieten it.
To make it totally silent, I made a post silencer silencer, to make this I made a tube of stiff wire mesh the same size as the ducting (chicken wire will not do the job) and I then wrapped builders scaffold mesh around it (this is the green mesh you see on scaffold and is made from plastic) after wrapping a good few layer of mesh around the wire tube, fix to your silencer or ducting.
This is now totally silent no sounds of air wooshing, no sound period.
Fiber glass is a bitch you don't want to breathe it in or get it in your eyes or on your skin!!!
wrap fans in cling film/saran wrap.
Make a box large enough to put fan in plus extra space to fill with insulation, you will need a hole saw to make openings at the end for ducting to conect to the fan. My box is made from MDF ans is screwed and glued together leaving one end unglued for maintenance etc.
If vibration is a problem you can hang the box from ceiling joists using suit able eye screws bungees cord dampers and carabiners to clip from bungy loops to ceiling eyes.
IT would be like this screw eyes in top of acoustic box, thread through bungy cord (can be bought by the meter) and mke it so there is a double loop and secure the loo with zip ties (this works very well and doesn't come undone). You then clip a caribiner through the bungee loop and clip on to ceiling screw eyes, screwed in to the wooden joist (not the plaster!!)
My acoustic box is on top of my solid wooden construction cab so i use breeze blocks on top to stop any vibrations and is disguised with with carbord box so it looks like a box a tv came in.
Ducting can make a fair bit of noise especially if there are bends in it. Acoustic ducting certainly helps.
A fan silencer helps to stop the whooshing noise that comes out the end but it doesn't completely quieten it.
To make it totally silent, I made a post silencer silencer, to make this I made a tube of stiff wire mesh the same size as the ducting (chicken wire will not do the job) and I then wrapped builders scaffold mesh around it (this is the green mesh you see on scaffold and is made from plastic) after wrapping a good few layer of mesh around the wire tube, fix to your silencer or ducting.
This is now totally silent no sounds of air wooshing, no sound period.
