Any Remedy For Noisy Heat Ducts?

[Ron]

I am a newbie and this is my first post.

Moved into first ever manufactured home a few months ago and it has a very annoying problem. Noisy heat ducts. Home is a 1995 Golden West super good cents with forced air electric heat. The underfloor heat ducts are rectangular ducts that appear to be aluminum. Two ducts run the length of house - one under each side of double wide.

Shortly after the heater starts to run- cracking and popping noises start throughout the house. And for a time after the heater shuts off - the cracking and popping noises continue. I am assuming the cracking and popping noises are due to expansion upon heating and then contraction on cooling of the aluminum heat duct and possibly a portion of the subfloor (?) the ducts are attached to.

Is there any remedy to stop the cracking and popping short of replacing the ducts with a different material?? Since this is a super good cents home the underside has thick insulation encasing the ducts with a membrane holding up the insulation. Biggest concern I have with replacing the existing ducting and/or way it is attached to subfloor- is getting acceptable job done putting back the insulation and repairing the membrane.

Any help out there for me??

Thanks!
Ron