TOODOO 2 Pack Flying Insect Screen RV Furnace Vent Screen RV Water Heater Vent Cover 2.8 Inch Stainless Steel Mesh with Installation Tool

Why I added vent screens to my RV

A few seasons ago, I opened my furnace compartment to find the early makings of a mud dauber condo. That was enough motivation to add screens to the small circular vents on my RV’s furnace and water heater. I’ve been running this two-pack of stainless vent screens from TOODOO for multiple trips and storage cycles now, and they’ve done exactly what I needed: keep bugs and critters out without creating headaches for installation, airflow, or maintenance.

In this review, I’ll walk through how these compact screens fit, install, and hold up on the road, along with the caveats I discovered that may matter depending on your vent face and model.

What you get and how it’s built

Inside the package you’ll find:
- Two stainless steel mesh screens (about 2.8 inches in diameter and 1.8 inches in height)
- Two spring hooks
- One small installation tool

The screens are a domed, fine stainless mesh (roughly 0.11-inch grid) welded to a circular rim. The mesh is stiff enough to resist dents and holds shape when pressed lightly. The domed profile creates a bit of standoff from the vent outlet so it doesn’t sit flush against the louvers, which helps both airflow and debris shedding.

The springs are light but adequate for gripping the vent louvers when installed properly. The included tool is petite—just a little rod with a notch—but surprisingly helpful for getting the springs positioned without chasing them across the driveway.

Fit and compatibility

These screens are sized for the common round exhausts I see on many Suburban and Duo-Therm furnace installations. On my rig’s furnace and water heater exhausts, the 2.8-inch diameter was a “just right” fit: large enough to cover the opening and engage the perimeter louvers, small enough not to interfere with adjacent trim.

That said, the fit depends on the shape of your vent face and how flush it is to the wall:
- Flat, circular vent housings are ideal. The screen’s rim sits evenly and the spring catches cleanly.
- If your vent face is irregular or protrudes unevenly, you may end up with a small gap along one edge. That’s not a dealbreaker, but it can create a pathway for tiny insects. I solved a minor gap on one install by slightly “ovaling” the screen rim by hand and rotating it until it sealed better. A thin self-adhesive, high-heat gasket strip would also close a gap without affecting removal.

If your furnace uses a non-standard or oversized exhaust, look at a larger cover or a model designed to span dual vents. For the typical round Suburban/Duo-Therm outlets, this size is a very practical match.

Installation: quick once you get the hang of it

The first install took me a couple of minutes while I figured out the technique; the second one took less than a minute. Here’s what worked best for me:
1. Hook one end of a spring into the screen’s rim, slightly off-center.
2. Use the included tool on the other end of the spring to hold tension.
3. Place the screen over the vent, then hook the free spring end into a louver slot.
4. Adjust the screen so it’s centered and seated, then release tension.

Two small notes:
- The spring end needs a clean bite on a louver. If the louver edge is rounded or thick, move one slot over and try again.
- Don’t overtension the spring. You’re aiming for firm, not guitar-string tight. Overtensioning can deform the screen rim.

I didn’t need additional hardware. If you camp on washboard forest roads or see extreme crosswinds regularly, a tiny dab of high-temp RTV on the spring’s hook (not on the vent) can add insurance while still allowing removal later.

Airflow and safety

Any time you place screening over a combustion appliance, airflow and exhaust are the concern. I tested the furnace and water heater through complete cycles with the screens installed, including several back-to-back furnace runs during a chilly shoulder season weekend. I didn’t observe longer cycling, unusual odors, or backdrafting. The mesh is open enough that it doesn’t meaningfully impede exhaust, and the dome maintains breathing room.

Important safety notes I follow:
- Check your manufacturer’s documentation. If your furnace or water heater explicitly prohibits covers or screens, follow that guidance.
- Keep your CO detector tested and powered.
- Inspect the screens regularly. If they’re clogged with lint, spider silk, or pollen, clean them before the next run.
- Never install any screen that touches the actual exhaust tip or blocks a pressure relief opening.

Used correctly, these screens add protection without compromising normal operation.

On-road performance and durability

I’ve driven through rain, dust, and a couple of windy passes with these in place. They’ve stayed put, with no rattles. The stainless mesh has resisted surface rust, and a quick rinse makes them look new again. They don’t trap much road grime because the mesh is fine but not fabric-like; debris tends to wash out.

One subtle plus: the rounded dome sheds water rather than collecting it. After a storm, a quick tap clears droplets. For long-term storage, I leave the screens on; critters are most opportunistic when the rig is stationary.

Maintenance and cleaning

Maintenance is minimal:
- A rinse with a hose or a soapy microfiber wipe removes dust and bug residue.
- If you camp in areas with cottonwood fluff or heavy pollen, check them more often. A soft brush from the outside clears buildup without deforming the mesh.
- If the spring loses some tension over time, you can bend the hook slightly to restore a snug grip.

I haven’t needed to replace the springs or screens, and the stainless finish remains clean.

Limitations worth noting

No product is perfect, and these screens are no exception. The caveats I’ve encountered:
- Uneven vent faces can leave a small gap. Consider a thin high-temp gasket or a model that spans a larger area if your surface is irregular.
- The single-spring attachment is simple, but on some louvers it can feel a bit soft. Proper placement solves it; if not, adding a second spring (not included) and hooking it to another spot on the rim increases security.
- These are specifically for small, round vents. If you have a refrigerator vent or a dual-vent furnace plate, you’ll need a different style.

None of these were dealbreakers for me, but they’re worth checking before you click “buy.” A quick measurement of your vent diameter and a look at louver geometry will tell you everything you need to know.

Practical tips from the install

• Measure the visible opening: If it’s close to 2.8 inches and the louvers are accessible, you’re likely good.
• Dry-fit first: Hold the screen to the vent, rotate to find the best seating, then install the spring.
• Slightly offset the spring: Off-center placement gives you control over tension and centering.
• Keep the screen dome clear: Don’t push the mesh against the exhaust tip.
• Inspect seasonally: Springtime is peak mud dauber season; make a quick inspection part of your de-winterization routine.

Value and alternatives

As a two-pack, this set covers exactly what most furnace/water heater setups need. You could source mesh and fashion your own guards, but by the time you bend a rim, add heat-resistant coatings, and create a clean mounting solution, you’ll have spent more time (and possibly more money) for a less tidy result.

Alternatives include:
- Larger combo screens that cover two adjacent vents in one piece.
- Magnet-backed guards (fast to install, but magnets can be unreliable on painted or non-ferrous surfaces).
- Zip-tie mesh wraps (cheap, but usually ugly and less secure).

For the common round vents on many travel trailers and Class C rigs, the TOODOO screens hit the balance of simplicity, clean looks, and practical protection.

Who will benefit most

• New RV owners outfitting essentials and storing outdoors
• Campers in wasp- and bee-heavy regions
• Anyone who has dealt with spiders building in exhaust paths
• Long-term storage in barns or fields where mice and birds explore openings

If you rarely run into insects or you store indoors in a sealed facility, this might be lower priority—but it’s still cheap insurance.

The bottom line

The TOODOO vent screens do their job with minimal fuss. They’re sized well for standard round furnace and water heater vents, the stainless construction holds up to weather, and the included tool makes installation straightforward once you get the technique down. Airflow has not been an issue in my use, and routine cleaning is quick.

I recommend these screens. They’re a simple, cost-effective safeguard against the kind of critter intrusion that can turn into an expensive repair. Just verify your vent size and louver layout first, and if your vent face is uneven, be prepared to finesse the fit or consider a larger cover. For most common setups, this two-pack is an easy win.