Quieting noisy generator?

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
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Generally little of the noise you hear is from the exhaust. A good portion of the noise is mechanical noise from the engine and generator itself. Other than moving it farther away, which you have said is out of the question, they will probably have to live with it. I would advise not changing the exhaust, or insulting the cabinet. Allot of thought has gone into air flow for engine cooling, and alterations may cause expensive problems.
That said I work for a Generac dealer. If you are talking about the new, (less than a year or so), 12K I am surprised! We regularly set them right near the home and have had no complaints of objectionable noise. Sure, you can hear them in the home, but they are about as loud as a lawn mower. Any questions, feel free to ask! Greg
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Try lining the room its in with some closed cell vinyl foam. It has great sound barrier properties. There is good information on this web site about soundproofing generators.
Super Soundproofing Co. 757 N. Twin Oaks Valley Rd. San Marcos, CA 92069 Technical Assistance 1-760-752-3030 Order Desk 1-888-942-7723 Fax 1-760-752-3040 www.soundproofing.org
On Tue, 12 Aug 2003 02:31:02 GMT, "Dog Ma 1" <spamdogma snipped-for-privacy@att.net (reply w/o spam)> wrote:

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Well if they are in the affected area im sure the sound isnt so bad now.
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