Has anyone insulated to cut down on furnace noise?

Thanks! But can soundproofing be directly applied to the outside of the furnace casing? Will that cause it to run warmer than it should?

Soundproofing is not simple but also not hard.

You can add mass to anything that resonates to dampen vibration. You can also use absorptive materials to break up sound frequencies. Dynamat is a mass loading self-adhesive product sold at car parts distributors and mobile sound installer shops. Fiberglass is a good absorptive material to use in enclosures and it's also non-combustible. It is made in compressed sheets for HVAC and spun variety for cavity insulation. Sold at building supply distributors and your local big box stores.

Good luck with the furnace.

Air return is where it sucks in air, yes?

Moved from Forum Technical Support

Old-Biscuit wrote:

That minimum is typically at least 55 sq. inches
Always meet minimum return air requirements

Yeah, I'll check on that. This means 55 sq inches of grill space? Like an 11x5 area (2D) of air intake left open, yes? Can the soundproofing be applied to the furnace itself or does there have to be an air pocket between the furnace shell and the soundproofing material?

Thanks for your help...

Where do you get soundproofing material?

Yes, reading about that now. They talk about affixing sound-proofing material to the walls of the enclosure but there is no enclosure. Just a board under and above it. the sides are open and go off into the basement. Could I say....velcro some soundproofing material to the areas of the furnace that are just metal housing and not vents? Would that help at all? And maybe put some across the front but not covering where the heat exits the rig through the outside wall?

RETURN AIR FLOW...........if restricted furnace will shut down, not run, keep tripping, overheat the heat exchanger.


Warning in all RV Furnace manuals:
RETURN AIR
The return air passage should be clean and clear of
obstructions and meet the minimum square inches as
specified in the installation instructions. Make sure
combustibles are not stored in the furnace
compartment. Filters are not recommended at these air
passages.

That minimum is typically at least 55 sq. inches
Always meet minimum return air requirements