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Noisy external wall mounted kitchen exhaust fan

Posted by Ausie123 (My Page) on
Wed, Sep 11, 13 at 7:44

Our neighbour has remodelled their kitchen. Looks lovely but the end result has been that the exhaust fan is now ducted out of their house and this forms our boundary wall. Both the noise and odour impacts us on the ground level.
We may have found a solution to the odour problem as they are going to install a carbon filter. But I am at a loss as to how to reduce the noise.
Their house is a two-story terrace (as is ours) and we have investigated exterior fluing it but it can only go 2 metres and I suspect that will just shift the noise to our bedrooms upstairs.
We have also investigated a duct silencer but this will negate their rangehood warranty.
The only other thing I can think of is to build some sort of insulation box around the outlet. I don't think we could fully enclose it as thismight be a fire hazard. But some sort of structure (maybe two sides of a box) might help? I have not seen this done anywhere else. Just wondered what your suggestion is. Photos or weblinks of this kind of structure would be great. As would any other ideas


Follow-Up Postings:

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RE: Noisy external wall mounted kitchen exhaust fan

If the fan is at the hood, then a silencer would help, possibly greatly help. I see no reason why the hood warranty would be affected other than the hood manufacturer covering its posterior against everything. The silencers from [US] Fantech have minimal restriction when matched to the duct diameter.

Also, depending on the legal climate, the neighbor has a duty to not significantly pollute your environment. Reducing noise should be his higher priority than maintaining the hood warranty, particularly considering that the cost risk is limited to a blower.

Perhaps more explanation about the 2-meter limitation would also help. Is this a neighborhood visual limitation? Height might move the apparent sound source to a better location, and in general the sound pressure level will drop in inverse relation to distance. However, given logarithmic hearing response, a significant distance might be needed for an apparent signficant reduction.

It will take a heroic carbon filter to remove odor from a serious frying or grilling exercise. This is why outdoor ducting is usually embraced, to remove the odor (and grease particles too small to collect at the baffles) to the external environment. They have to be released high enough to not easily propagate to neighbors' houses. An upblast blower on a roof usually accomplishes this, and is the design most used by restaurants in the US. Often having a larger blade diameter than the duct size on which they are mounted, upblast blowers will generate less tip turbulence noise than a small diameter blower would for the same flow rate.

kas


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