extractor fan rubber mounting kits

[Fred]

Hi,

I have read here about using some sort of rubber mounting when you fit
an extractor fan, so that the vibration of the fan doesn't shake the
wall/ceiling it is mounted on, transferring the noise. The problem is
I don't know the correct name for these rubber fixings, so google is
not my friend. Can anyone tell me what they are called and where to
get some?

TIA

[Alan]

In message <frc206p4sv9mlnrl6...@4ax.com>, Fred
<fr...@no-email.here.invalid> wrote

<http://www.quietpc.com/gb-en-gbp/products/casefanaccessories>
Not the cheapest but once you can identify some key words search Ebay
etc.

Example from a 2 Ebay second search
<http://cgi.ebay.co.uk/12-ACOUSTI-FAN-MOUNTS-ANTI-VIBRATION-SILICONE-FAN-
SCREW-/370361632455?cmd=ViewItem&pt=UK_Computing_DesktopComponents_RL&has
h=item563b4606c7>
--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk

[geoff]

In message <frc206p4sv9mlnrl6...@4ax.com>, Fred

<fr...@no-email.here.invalid> writes

Typing "Anti vibration mounts" into google will bring endless hours of
fun for you to while away those summer evenings with

--
geoff

[NT]

Tap washers. Dont forget to use 2 per fixing screw, one each side of
the fan case plastic.

NT

[DaveN]

For want of better materials to hand, I made a 40cm-square 'mounting
table' for a fairly big loft extractor fan by sandwiching four foam
scouring pads between a couple of pieces of 18mm chipboard, all held
together with hot glue. It works fine - the fan is sitting on top of a
ceiling joist, and is inaudible in the bathroom beneath.

I haven't had so much success with rubber isolators. Alternating
materials of high and low stiffness in a sandwich is how some 'proper'
vibration isolators work.

I think the other trick for a loft fan is to hang it on a loop of
nylon string at each end, suspended from the roof structure (not in
mid-air, just so it doesn't touch anything which will conduct the
sound).

Dave

[NT]

DaveN wrote:
> On 29 May, 17:34, Fred <f...@no-email.here.invalid> wrote:
> > Hi,
> >
> > I have read here about using some sort of rubber mounting when you fit
> > an extractor fan, so that the vibration of the fan doesn't shake the
> > wall/ceiling it is mounted on, transferring the noise. The problem is
> > I don't know the correct name for these rubber fixings, so google is
> > not my friend. Can anyone tell me what they are called and where to
> > get some?
> >
> > TIA
>
> For want of better materials to hand, I made a 40cm-square 'mounting
> table' for a fairly big loft extractor fan by sandwiching four foam
> scouring pads between a couple of pieces of 18mm chipboard, all held
> together with hot glue. It works fine - the fan is sitting on top of a
> ceiling joist, and is inaudible in the bathroom beneath.

do consider longevity of materials.

NT

[Chris J Dixon]

geoff wrote:

>In message <frc206p4sv9mlnrl6...@4ax.com>, Fred
><fr...@no-email.here.invalid> writes
>>

>>I have read here about using some sort of rubber mounting when you fit
>>an extractor fan, so that the vibration of the fan doesn't shake the
>>wall/ceiling it is mounted on, transferring the noise. The problem is
>>I don't know the correct name for these rubber fixings, so google is
>>not my friend. Can anyone tell me what they are called and where to
>>get some?
>>
>Typing "Anti vibration mounts" into google will bring endless hours of
>fun for you to while away those summer evenings with

These can reduce conducted noise, though it is always possible
that you might create a system which has a resonance in the
frequency band(s) the extractor produces. What you will not do is
reduce air movement noise.

Chris
--
Chris J Dixon Nottingham UK
ch...@cdixon.me.uk

Have dancing shoes, will ceilidh.

[geoff]

In message <ub8a061779uonbcdc...@4ax.com>, Chris J Dixon
<ch...@cdixon.me.uk> writes

>geoff wrote:
>
>>In message <frc206p4sv9mlnrl6...@4ax.com>, Fred
>><fr...@no-email.here.invalid> writes
>>>
>>>I have read here about using some sort of rubber mounting when you fit
>>>an extractor fan, so that the vibration of the fan doesn't shake the
>>>wall/ceiling it is mounted on, transferring the noise. The problem is
>>>I don't know the correct name for these rubber fixings, so google is
>>>not my friend. Can anyone tell me what they are called and where to
>>>get some?
>>>
>>Typing "Anti vibration mounts" into google will bring endless hours of
>>fun for you to while away those summer evenings with
>
>These can reduce conducted noise, though it is always possible
>that you might create a system which has a resonance in the
>frequency band(s) the extractor produces. What you will not do is
>reduce air movement noise.
>

Its what he asked for

and ...

strangely enough, its what they use in e.g. warm air fans just for the
purpose

--
geoff

[Fred]

On Sat, 29 May 2010 10:43:26 -0700 (PDT), NT <meow...@care2.com>
wrote:

>Tap washers. Dont forget to use 2 per fixing screw, one each side of
>the fan case plastic.

Thanks. I may try the tap washers before looking for anything else as
they will be easy to get hold of. BTW, when was the last time anyone
changed a tap washer? I can't remember having to.

[NT]

Also theyre very long lasting, which is important.

NT

[Fred]

On Tue, 1 Jun 2010 20:22:30 +0100, geoff <tr...@uk-diy.org> wrote:

>>These can reduce conducted noise, though it is always possible
>>that you might create a system which has a resonance in the
>>frequency band(s) the extractor produces. What you will not do is
>>reduce air movement noise.
>>
>Its what he asked for

Yes, it was noise conducted through the wall that I was trying to
avoid. Any noise of the air on its way through the ducting, I hope
will be minor in comparison and I can live with that. Thanks.