Lonffery Trailer & RV Sidewall Exhaust Vent Kit, 2-Pack — 3" Bore, Weather-Resistant Plastic Cover

Lonffery's Trailer & RV Sidewall Exhaust Vent Fan Kit (2 pack) is a heavy-duty side-mounted vent and cover set designed to improve air circulation in trailers, RVs, campers, and truck boxes.

This compact vent kit brings continuous sidewall airflow without cutting large roof openings. Each unit is molded from durable plastic to withstand road vibration, sun exposure, and weather while offering a simple bolt-on installation. The vents work with a standard 3" hole and have larger external dimensions to create a neat finished appearance on your vehicle's side panel.

How does this vent kit improve airflow inside an RV or trailer?

The Lonffery sidewall exhaust vents let stale air escape and encourage fresh outside air to move through the cabin or cargo area, reducing odors and trapped moisture. Because they mount low on the sidewall, they provide passive cross-ventilation when paired with intake vents or open windows. These vents are especially useful when roof access is limited or you prefer a more discreet installation.

• Promotes passive exhaust to reduce stale air buildup
• Pairs with intake openings or fans for cross-ventilation
• Built to sit flush on a sidewall for tidy airflow routing

What are the dimensions and installation requirements?

Each vent has external measurements of 8" x 6" for the finished cutout appearance. Internally, the vent's outer diameter measures about 4.125" and the inner bore is 3", so you must cut or have an existing 3" hole in the trailer sidewall for proper passage. Mounting is done with bolts, keeping the process straightforward and avoiding specialized tools.

• External faceplate: 8" x 6" for a clean fit and cover
• Internal outer diameter: 4.125"; inner bore: 3"
• Requires a 3" through-hole and bolt-on fastening for installation

How durable and weather-resistant is the Lonffery sidewall vent?

Constructed from heavy-duty plastic, each vent is formed to resist vibration, UV exposure, and routine weathering encountered on highways and at campsites. The reinforced design keeps the vent stable under motion while the cover helps shield the opening from rain and debris. For long-term performance, periodic inspection of mounting fasteners and sealant is recommended.

• Rugged plastic resists road vibration and sun damage
• Protective cover reduces water and debris entry
• Simple maintenance: check bolts and seals occasionally

Can this vent kit fit different vehicle types?

The Lonffery sidewall exhaust vent is made as a universal fit for many trailers, campers, RVs, and truck boxes that can accommodate a 3" hole. Because of the bolt-on faceplate, it adapts well to various panel thicknesses and exterior contours. If your vehicle has nonstandard walls, measure carefully to confirm compatibility before purchasing.

• Designed for RVs, travel trailers, campers, and utility trucks
• Works with side panels of varying thickness due to bolt mounting
• Measure existing openings or plan for a 3" through-hole

Who is this for: The Lonffery Trailer & RV Sidewall Exhaust Vent Fan Kit (2 pack) is aimed at RV owners, trailer fleet managers, camper DIYers, and truck operators who need reliable sidewall ventilation without a roof installation. It suits anyone seeking a durable, easy-to-install vent to improve airflow, reduce odors, and protect cargo or living spaces from moisture buildup while on the road.