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Postby Itsallaguess » August 20th, , 6:21 pm

Link to teao

Additional reading:
How to Choose the Best Automotive Soft Motion Damper Solution?

PrincessB wrote:
While the extractor is fine when in the bathroom (the room below) the noise in the upstairs bedroom in unendurable if someone turns the bathroom light on and triggers the motor during the night.

We've got an in-line extraction fan (

I've been over the moon with both the noise-improvement and also the large extraction-rate increase that this fan offers, but I think it's very important to get the mounting arrangement of any type of domestic-fan arrangement as good as you can get it, mainly due to the vibration issues that you seem to be experiencing. Even low-level vibrations, if fans are mounted inappropriately, can cause real issues, but the good news is that cheap, simple remedies are often available to you.

Can you describe the actual mounting arrangements that you've currently used under your floor?

I mounted my fan on one of the main roof-beams passing through my loft, and the bulk of the wooden beam is large enough to soak up most of the natural vibrations of the fan. On top of that though, just for a belt-and-braces approach, I used four of these rubber-buffers between the base of the fan and the wooden beam, to act as an extra set of vibration-dampers to help even further -

http://www.wilko.com/all-hardware/wilko ... vt/

For a quid or so, the extra removal of low-level vibrations was really excellent, so this might be worth thinking about. An extra step I was thinking about, if the above proved not to be good enough, was to use a doubled-up section of carpet or carpet underlay cut to the same size as the base-plate, and also use that to soak up some of the vibrations. We're basically looking for anything cheap that will soak up vibrations and stop them passing through to the underlying wood-work, which is where most of the issues then present themselves.

If you've got room between your floor-boards, I'd even perhaps look into some sort of free-floating 'cradle' arrangement for the fan, perhaps with thin but strong multi-strand wire attached to opposite sides of a couple of joists, with the fan suspended in the centre to take the weight. With the flexible ducting then being the only mechanical connection to the fan, I'd imagine that would be the best anti-vibration arrangement that you're going to achieve without a lot of further work.

Some suggestions for good wire-based suspension -

http://www.screwfix.com/p/wire-rope-gre ... -10m/

http://www.screwfix.com/p/apollo-2mm-2m ... -30m/

With some big washers (

Cheaper alternatives might be available, so these are only suggestions, and if using the thinner wire then I'd probably thread a few passes of the wire backwards and forwards across the gap and through the base-plate, to ensure the weight if the fan is being taken properly, but this is something worth thinking about if you've got the room in the area you're currently using under the floor.

It's an interesting problem that usually doesn't need a great deal of extra expense to solve, so have a think and test a few things, starting at the cheapest end of the 'damping-spectrum', with rubber mounts and things, and work your way up until you're happy. I'd be very surprised if you can't cheaply and easily achieve an acceptable level of noise and vibration from your current position.

Cheers,

Itsallaguess

We've got an in-line extraction fan ( http://tinyurl.com/yaqzclae ) mounted in our loft, which replaced one of the 'normal' ceiling-mounted fans which drove me bonkers with the noise and vibration that it produced.I've been over the moon with both the noise-improvement and also the large extraction-rate increase that this fan offers, but I think it's very important to get the mounting arrangement of any type of domestic-fan arrangement as good as you can get it, mainly due to the vibration issues that you seem to be experiencing. Even low-level vibrations, if fans are mounted inappropriately, can cause real issues, but the good news is that cheap, simple remedies are often available to you.Can you describe the actual mounting arrangements that you've currently used under your floor?I mounted my fan on one of the main roof-beams passing through my loft, and the bulk of the wooden beam is large enough to soak up most of the natural vibrations of the fan. On top of that though, just for a belt-and-braces approach, I used four of these rubber-buffers between the base of the fan and the wooden beam, to act as an extra set of vibration-dampers to help even further -For a quid or so, the extra removal of low-level vibrations was really excellent, so this might be worth thinking about. An extra step I was thinking about, if the above proved not to be good enough, was to use a doubled-up section of carpet or carpet underlay cut to the same size as the base-plate, and also use that to soak up some of the vibrations. We're basically looking for anything cheap that will soak up vibrations and stop them passing through to the underlying wood-work, which is where most of the issues then present themselves.If you've got room between your floor-boards, I'd even perhaps look into some sort of free-floating 'cradle' arrangement for the fan, perhaps with thin but strong multi-strand wire attached to opposite sides of a couple of joists, with the fan suspended in the centre to take the weight. With the flexible ducting then being the only mechanical connection to the fan, I'd imagine that would be the best anti-vibration arrangement that you're going to achieve without a lot of further work.Some suggestions for good wire-based suspension -With some big washers ( http://www.wilko.com/all-hardware/wilko ... t/# ) and wood-screws at each end of the wires, you should be able to get a good mounting-arrangement that removes almost all the pass-through vibration that you're currently experiencing, I'd imagine.Cheaper alternatives might be available, so these are only suggestions, and if using the thinner wire then I'd probably thread a few passes of the wire backwards and forwards across the gap and through the base-plate, to ensure the weight if the fan is being taken properly, but this is something worth thinking about if you've got the room in the area you're currently using under the floor.It's an interesting problem that usually doesn't need a great deal of extra expense to solve, so have a think and test a few things, starting at the cheapest end of the 'damping-spectrum', with rubber mounts and things, and work your way up until you're happy. I'd be very surprised if you can't cheaply and easily achieve an acceptable level of noise and vibration from your current position.Cheers,Itsallaguess

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