Mod #38: Furnace Screen

Mod #38: Furnace Screen

Submitted on: 07/15/08

     Category: exterior, heating
Mod Rating: 12345

(30 ratings)

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Mod Description:

The external furnace vent openings are inviting holes for critters to enter and nest in. Mud daubers, wasps, mice and small birds are only a few of the various types of creatures that will find these openings and make themselves a nice little home, especially if you store your RV and don’t use it for awhile. Over time, this can block the vent openings and thus render your RV furnace, at worst, unusable. But, if by some miracle your furnace vent is not completely blocked and does work, you will be in for a smelly surprise when the critter’s little home (and the critter!) ignites and its remains melt to the walls of the vent pipe.

Mod Difficulty:

The furnace screen (or mud dauber screen as it is often called) mod is just the solution to this problem. Fabricated out of heavy duty stainless steel, it fits perfectly over your RV furnace vent pipe opening located on the side of your RV. This protective screen will prevent such creatures as mud dauber wasps, bees, hornets, mice and other small rodents, as well as small birds, etc. out of your furnace vent pipe(s).

The furnace screen is easy to install, and requires no special tools. Using a screw driver, remove the screws holding the furnace access door. Open or remove the access door and place the furnace screen in the framed opening of the intake/exhaust opening. The screen bubble should protrude through the exhaust port opening. Close the access door and replace the screws. The furnace screen is simply held in place when the access door is closed. This install assumes you have a single vent hole. Other furnace vents will require a different screen type based on the type of furnace.

Maintenance should be performed semi-annually where the screen should be inspected for cleanliness. If debris is observed, remove and clean the screen. Also, the screen should be visually inspected during any pre-trip walk-around to ensure that nothing such as dirt or leaves is blocking the vent opening, which will prevent normal operation of the furnace.

TipYou can also purchase screens to protect your RVs water heater and refrigerator vent openings. The refrigerator vent screen takes a little more effort to install but is definitely a worthwhile mod.


ModMyRV recommends these parts for this mod:
JCJ ENTERPRISES M-800 MUD DAUBER SCREEN M-800 ATTWOOD
JCJ ENTERPRISES M-300 MUD DAUBER SCREEN M-300 DUO/SUB
MUD DAUBER SCREEN/RV STOVES

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12 Comments For This Mod

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  1. Bob Vaughn

    Until I did this mod to all my ext. openings I used to get geckos and wasps, dirt daubers and all kind of critters building homes in my water heater, heater etc…..I even took fiberglass screen and using duct tape screened off the vent holes on my refrigerator cover…..

  2. ModMyRV

    It’s one of the simplest and easiest cost saving mods that can be done!

  3. jmt

    I think I’ll add this to my “To Do Mods” list.

  4. Bob Vaughn

    Before I did this mod I opened my water heater compartment and immediately got stung from one of the wasps from one of the two wasp nests inside the compartment….

  5. jmt

    Can’t those little critters still get in?

  6. Bob Vaughn

    JMT with these screens nothing gets in except mabey ants…..
    http://community.webshots.com/album/570449407QzHKUH

  7. tvman44

    Very simple and will keep out the dirt daubers that build mud nest on anything that does not move for more than 5 minutes.

  8. Dave Planitzer

    To save even more money:
    Wallmart (and others) sell a stainless steel sink strainer for a couple of bucks that works perfectly for the furnace discharge. And a pet flea collar works for all other LP compartments.
    Not a lot of $$ for either

  9. Trailblazer

    I just did this mod. It took less than 3 minutes.

  10. Dave Planitzer

    Another inexpensive bug deterrent is a dog flea collar. Get a large from the Dollar store. Cut it in half. Then place one half in the water heater compartment, outside, and the other half in another compartment that might be inviting to critters.
    I’m looking for a way to keep the birds from building nests in the spare tire and on top of the propane tanks.

  11. daveinwa

    WOW! A mod I did in 2 minutes. Gotta like that…

  12. cle

    Cost of getting a Mud daubers out of your furnace $80 dollars.. so please do this mod

1 Trackbacks For This Post

  1. 10 Low Cost Mods You Can Make to Your RV

    [...] 8. Furnace Screen - The external furnace vent openings are inviting holes for critters to enter and nest in. Mud daubers, wasps, mice and small birds are only a few of the various types of creatures that will find these openings and make themselves a nice little home, especially if you store your RV and don’t use it for awhile. Over time, this can block the vent openings and thus render your RV furnace, at worst, unusable. The furnace screen (or mud dauber screen as it is often called) mod is just the solution to this problem. Fabricated out of heavy duty stainless steel, it fits perfectly over your RV furnace vent pipe opening located on the side of your RV, and prevents anything from getting in. Costs about $15 and snaps right on. Here is an example: http://www.modmyrv.com/2008/07/15/rv-furnace-screen [...]

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