Problem: Our house in the city shares a common wall with our neighbor. At the back of the house, our dryer vent is positioned about 8 feet from this common wall. Nothing is wrong with the dryer according to a repair- person and anyone's casual observation. The vent pipe is not obstructed at any point. The exhaust vent fan (or dryer blower?) does make a typical "whirring" noise which escapes from the vent and resonates in a way which disturbs the neighbor. As crazy as it seems, I now believe it's a legitimate problem for them due to the configuration of the buildings and back yard.
Considerations:
-- I could possibly re-route and add to length of vent (limited by dryer spec, of course), but would prefer not to. Besides, I'm not sure it would help much by itself.
-- This is actually a dispute between our tenant and our neighbor, so I'd like to keep them both as happy as possible. It's also been a long-term problem.
Proposal: My idea is to build a "sound-absorbing" box (approx 2' x 2') which simply attaches to the building, over the existing dryer vent. I don't want to restrict air-flow in any way, so the box would have to have to have an appropriate opening for the air to escape. I'm envisioning a simple box [a] lined with some sort of thick, sound- absorbing foam, [b] having a hinged door to allow any cleaning/lint removal, and [c] having a sufficient design to allow for adequate air- flow.
Questions:
- I know acoustics is a complex area. However, could something like this actually mitigate the "whirring" sound of a clothes dryer as it exits at the vent?
- I've researched acoustic foams on the web. Any thoughts on what types might work best for this application?
- Would the placement of the air-flow exit hole(s) within the box impact the efficiency of any foam?
- Any other design elements (or other suggestions) which I should consider?
Thanks!!!