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Aug 16, 2018 at 15:06 vote accept Andrew Eisenberg
Aug 16, 2018 at 15:06 comment added Andrew Eisenberg Good points. Thanks for your advice. I bought some sound deadener off of amazon and I will try the towel. Let's see how this goes...
Aug 15, 2018 at 18:46 comment added fixer1234 @AndrewEisenberg, the melting point of the fiberfill is hundreds of degrees and the ignition point is well above that. It's also contained in a metal duct. As for the towel, when you put it through the dryer, it's exposed to much higher temperatures than an air duct (and you can also put pillows in a dryer). If the air in the duct was hot enough to be a problem, you're be igniting curtains above heating registers at windows, and setting the wooden house structure around the duct on fire. When the furnace is on, you can hold you hand over a register.
Aug 15, 2018 at 13:10 comment added Andrew Eisenberg Thanks for some very clear explanations. My biggest concern about stuffing anything into the duct that doesn't belong there is fire hazard. The air going through is dry and warm. Should I be concerned?
Aug 15, 2018 at 7:56 history answered fixer1234 CC BY-SA 4.0