... won't some of the sound just travel through to the rest of the home. even with mufflers?
TBD ... A separate 8" supply duct (some of which is flex) was run off the main supply far from the HT. The overall length is something like 40 feet to the vent in the HT. Right outside the HT the 8" duct expands into a 6 foot S shaped 16" duct surrounded by safe and sound after which goes back to an 8" duct again. The 16" flex is designed with plenty of length (like an accordion) to move and absorb energy. My thinking is that the sound pressure would be reduced 4x by expanding into the larger flex and that a lot of energy will be dissipated by the large flex wall area. Some will make it though to the other side but how much I don't know. Since I put in a access panel I can experiment.
