oso954, I can hear voices come out of my stove exhaust, when the neighbors are in their yard talking in a normal tone.
This reminds me of our kids using the under slab PVC duct pipes as an intercom long time ago when the house was new. The grand kids haven't discovered that convenience so far but I'm sure that may change.
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I noticed your in Florida, correct?
If so how they installed your vents is likely due to building codes. All penetrations need to be tarred/bulled on all sides, if i recall correctly.
Wind uplift, and all that. Its unfortunate but its more for safety in a hurricane than proper installation. Don't want metal blowing around.
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