I too am thinking of adding some sound deadening material around the device.
Sort of thinking out loud here but I hope to maybe affect to aspects of the sound issue.
Since the ceiling chute assembly is no longer needed I'm thinking of installing a cut to fit MERV8 filter accross that area.
It is very thin and similar materials of the upgrade RV filters that can be purchased for the return vents filters.
It has a grid for reinforcement.
https://www.lowes.com/pd/Purafilter-20x25-Purafilter-Adjust-Wash-Flt/5005841635
It should sandwich between the grille and the duct collor, where the chute collar was and use those screws from the chute assembly with fender type washers to secure the filter in place in place.
Remove the original filters and open the 2 chute vents.
A couple of things get accomplished in the direction of reducing the noise:
1) Now have the new filter acting as damper and isolation clean accoss the total duct collar opening.
2) the effective area of filtering is totally accross the whole openning now.
3) The air flow differential pressure will be reduce (theroretically) since it is larger cross section.
4) This lower differential should also reduce the noise also (therorectically).
5) It's inexpensive. And installation is reversable.
The only negative is replacing the filter when it needs changing but may be I learn something with the testing
I plan to try to test this weekend in preparation of our next trip.
Comments?
Patent Pending
