Powered by Blogger.
We are saddened to announce the passing of Gary Bunzer on April 17, 2020. We hope the RV Doctor website will continue to provide helpful information for you. Thank you for your interest and support for the RV Doctor - Debbie, Heather and Gretchen

Saturday, October 24, 2009

Generator Exhaust

I could really use your help. I recently purchased a used, gasoline powered 1994 motorhome. When I got it home I found that the Onan generator did not have an exhaust on it any longer. I have been unable to find where to extend the exhaust. Neither the manufacturer nor Onan seemed to be able to help me. I don't know if the exhaust should be run to the side of the motor home or directly down underneath the coach. I have not seen another coach like it to inspect it to find how is should be extended.
Clif, (North Zulch, TX

Clif, I am assuming the exhaust manifold and muffler are still intact and that you are simply missing the tail pipe extension, correct? Typically, the exhaust pipe is routed to the closest side or to the rear of the coach, whichever is the shortest run. It should not terminate directly underneath the coach. According to current RV codes and standards, it must extend beyond the sidewall by one-inch and not terminate directly below any window that has the capacity to open. Also, it must not terminate within six-inches of any item that opens into the interior of the RV such as a storage compartment or entry door. You’ll want to minimize the amount of turns the exhaust pipe makes. More elbows or turns in the piping increases the backpressure on the exhaust system. Be sure to support the exhaust pipe every two or three feet using appropriate tail pipe hangers of the correct diameter.


In all instances, every effort is made to ensure the correctness of all content on the RV Doctor Website. It is imperative that if you choose to follow any instructions or procedures outlined on any page of this website, you must first satisfy yourself thoroughly that neither personal nor product safety will be compromised or jeopardized.

All rights reserved.

If you are in doubt or do not feel comfortable about a procedure, do not continue. Simply call your local RV service facility and make an appointment with them. The advice, recommendations and procedures offered by the RV Doctor are solely those of Gary. They do not necessarily reflect the opinions, procedures and recommendations of our sponsors or advertisers.