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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

Friday, October 30, 2009

No Screens Please

Do you have a source for mud dauber or wasp screens for the furnace inlet and outlet vent?
Bill, (Broken Arrow, OK)

Bill, I do not recommend blocking the fresh air inlet tube or the hot exhaust on the RV furnace with any type of screen, as popular as they seem to be. Any air restriction of these components will cause erratic appliance operation and shorten the life of the appliance. I do, however, recommend taping off those openings during winterizing or other periods of storage or non-use to keep the critters out, but during actual RV use you do not want to modify or impair air flow in or out of the unit.

All mud dauber's nests should be checked for and routinely removed during the annual cleaning of the furnace. The photo exemplifies the importance of annual furnace maintenance, but during the actual operation of the furnace, keep those tubes free from any obstructions! Including those screens commonly found in accessory stores.


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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.