Quote:
Originally Posted by ApS
My BIL simply threads a thin-wall pipe from the exhaust port, and extends it about 8-feet straight upwards. No muffler, and the noise simply disappears into the atmosphere. 
This was necessary, as the generator is mounted within an RV, and some discriminating campgrounds can be very fussy about noise.
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I would recommend some type of bend at the top or a flapper to keep water out when not in use.