My elderly parents have a Generac (12 kW, I think), fueled by natural gas, for emergency backup. Weekly self-tests and occasional real use are upsetting to them due to the high noise level. Re-siting is not an option, and simple baffling with boards leaned against the metal case doesn't make much difference.
Store and installer were no help. Does anyone know if it's practical to add a much bigger muffler to these units? Aside from warranty issues, are there any concerns for safety, damage to engine, etc?
Thanks in advance-
DM