Layhit RV 5.25" Round Foam AC Vent Filters - 20-Pack, Double-Layer Polyester, Blue/White

Layhit 20-piece 5.25" round foam air filters are plug-and-play vent replacements designed to fit most RV and camper AC ducts and help keep airborne debris from entering your system.

If you own an RV, camper, motorhome or compact vehicle with a 5.25-inch round duct, these Layhit foam filters provide an affordable way to refresh cabin airflow and protect interior vents and equipment. Each pack contains 20 double-layer filters in blue and white polyester fiber, sized to work with ducts around 5.25" in diameter and about 0.59" thick. They’re simple to trim, install, and swap on a regular schedule to maintain consistent airflow and reduce accumulation of dust, pollen, hair, and other particulates in the ductwork.

How do these filters fit my RV or camper vents?

The Layhit foam filters are made for round ducts near 5.25" diameter and have a standard thickness so they slide into most vent openings easily. If your duct is slightly smaller, the foam can be trimmed to size with scissors for a custom fit. Installation is tool-free and takes only a minute per vent.

• Designed for ducts up to ~5.25" diameter and ~0.59" thickness
• Blue side faces the air inlet; white side faces the outlet
• Can be cut to fit nonstandard openings
• Plug-and-play installation — no tools required

What kind of particles will these foam filters capture?

Constructed from a double-layer polyester fiber, the filters trap common airborne debris found in mobile living spaces such as dust, pollen, pet hair, and larger particulates. They’re intended as maintenance filters to reduce visible buildup and help prolong component life rather than as medical-grade filtration.

• Two-layer polyester construction for staged capture
• Effective against dust, pollen, hair, lint and coarse particles
• Blue layer faces incoming air for optimized flow direction
• Not a HEPA or medical-grade filter — designed for general air cleanliness

How often should I change these filters and how many are included?

• 20 filters per package for long-term upkeep
• Recommended replacement: every 1–3 months depending on conditions
• Extra supply useful for yearly maintenance or multiple vents
• Simple replacement reduces time spent on upkeep

Will installation affect airflow or require tools?

These foam inserts are engineered to keep air flowing while catching larger particulates; their open polyester structure is balanced for minimal airflow restriction. Because they’re thin and flexible, they install without tools and sit flush in most standard round vents. If you need a snug fit, a small trim is all that’s necessary.

• Low-profile 0.59" thickness to limit airflow resistance
• Flexible foam allows easy insertion and removal
• No adhesives or brackets required for typical vents
• Can be trimmed for a tighter seal when needed

Who this is for: Layhit’s 20-pack 5.25" round foam filters are ideal for RV and camper owners, fleet operators, or anyone maintaining multiple small vents who wants an economical, easy-to-install solution for reducing visible dust and debris in ductwork. They suit seasonal maintenance programs, users with pets, and those who prefer a ready supply of disposable replacements rather than frequent individual purchases. These filters are best used as routine service items to help keep vents and interior equipment cleaner; they are not intended to replace specialized medical-grade filtration.