8531 Furnace Duct Adapter Install Questions
https://www.amazon.com/Hydro-Flame-Corp-31474-Adapter/dp/B00CLSWS6I I have an 8531 furnace with 4" knockouts for the ducts. The duct adapter is listed as 1474 in the manual, but get this on Amazon...
Forum Discussion
subcamper wrote:
I have added lots of these to my home HVAC system.
You can buy them at Home Depot, Lowes, etc. Just find one that fits the hole/duct size.
Usually they have a bunch of fingers that you reach through the hole and bend over against the inside of the plenum to hold it in place.
Steve
Great! Thanks to both replies. I understand it now.
