Ducting for Home Theaters

[tonyvdb]

As Bruce has already stated earlier Mass is the only real way to stop sound from leaving a space. On the ducting issue remember one thing that every 90 degree turn you make you loose 6% of the airflow to resistance and even more if you use flexible ducting as the bumpy surface (unless stretched out fully) causes resistance as well and increases the noise level of the airflow.

[jpk]

blekenbleu wrote:

If those returns are wood on 3 sides, I wonder whether that meets code for new construction.
Anyway, I salvaged most of that sheet metal for other purposes and replaced it with fiberglass duct board.


I assume that your system has vibration isolators between trunks and the air mover..

I may do the duct board replacement.

What are vibration isolators? Is this the rubber device between the top of the furnace and supply duct. One could think it could also be used to connect if alignment isn't perfect between them?
I've also thought about isolators between bottom of furnace and floor?

Joe

[jpk]

bpape wrote:

Same kind of thing. I can get it at a somewhat reasonable price. PM me

Bryan

Thanks Bryan,
I'll get a hold of you.