Making an rv furnace quieter
Every rv furnace we have ever had was noisy. Has anyone done something to quiet there furnace. I have considered trying to wrap the blower area in insulation. Anyone had any luck?
Forum Discussion
fncampn wrote:Dutch_12078 wrote:
The majority of the sound from our two furnaces comes from the large cold air returns. I lined the area behind the grills with a sound absorbent material, and even blocked off a section of the over sized grill with the same material, being careful to still exceed the manufacturer's required minimum opening area and minimize restricting air flow. The sound level reductions were significant, although I didn't take any before/after measurements.
Instructions for the mod Dutch made can be found here: Soundproofing a noisy furnace
For "Sound Absorbent Material" for this mod, I would use acoustic foam panels readily available on-line and elsewhere. They are usually egg-crate, pyramid, or ridged foam panels about an inch thick. Make sure they're flame proof. They are amazing at absorbing sounds, particularly at the frequency of most fans. You can glue them to the inside of the furnace cabinet, of course keeping away from the actual furnace.
If your cold-air grate has the typical 10" x 20" opening (200 square inches) and your furnace requires the typical 80 square inches of return air area (see the manual for your furnace), then I would use an acoustic foam panel to block half of the cold-air grate, which allows about 10" x 10" or 100 square inches.
