Kentucky Air Duct Pros guide
Kentucky Manufactured Home Dryer Vents: Skirting, Slope and Termination
In a manufactured home, the dryer vent has to run all the way to the outdoors and end beyond the skirting — never underneath the home. Federal standards and Kentucky's Department of Housing, Buildings and Construction both say so, and Kentucky warns that exhaust ending under the home lets excess material accumulate there. With about one in ten Kentucky housing units a mobile home, it's worth checking where yours ends. Cleaning clears lint; a vent that ends in the wrong place needs to be corrected.
Updated October 19, 2026Sources listed below
Why this matters in Kentucky
In the Census Bureau's 2024 American Community Survey, about 10% of Kentucky housing units were mobile homes, compared with about 5% nationally. Kentucky's Department of Housing, Buildings and Construction publishes site preparation and post-installation guidelines for these homes, including a specific section on the clothes dryer vent.
Sources: U.S. Census Bureau — American Community Survey 2024 1-year estimates, table B25024 (Units in Structure); Kentucky Department of Housing, Buildings and Construction — Manufactured home site preparation and post-installation guidelines (HBC MH-17)
Where the dryer vent must end
Federal manufactured-home construction standards require gas and electric dryers to be exhausted to the outside through a moisture-lint exhaust duct and termination fitting. The exhaust duct shall not terminate beneath the home, and it must not be connected to any other duct, vent or chimney.
Federal installation standards add that the vent must exhaust to the exterior beyond any perimeter skirting, and that the exhaust system must not contain a reverse slope or end under the home.
Kentucky's guidelines say the same in plain terms: the dryer duct shall be continuous and terminate outside the perimeter of the home and outside any skirting or foundation. They also note that the rough-in opening for a dryer vent may go through the floor or an exterior wall, and that dryer vents pass through the skirting to the outside.
Sources: 24 CFR 3280.708 — Manufactured home construction standards: clothes dryer exhaust duct system (Cornell LII); 24 CFR 3285.503 — Manufactured home installation standards: optional appliances (Cornell LII); Kentucky Department of Housing, Buildings and Construction — Manufactured home site preparation and post-installation guidelines (HBC MH-17)
Problems worth looking for
Most of these can be spotted from outside the home or behind the dryer.
- A vent that stops under the home or behind the skirting instead of passing through it.
- A duct that sags, dips or runs uphill and back down — the federal standard rules out a reverse slope.
- A dryer duct tied into another duct, vent or chimney.
- An outdoor vent flap that doesn't open when the dryer runs, a basic check USFA recommends.
- Lint collecting at the outside opening, or loads that take longer to dry than they used to.
Sources: 24 CFR 3280.708 — Manufactured home construction standards: clothes dryer exhaust duct system (Cornell LII); 24 CFR 3285.503 — Manufactured home installation standards: optional appliances (Cornell LII); U.S. Fire Administration — Clothes Dryer Fire Safety (flyer); NFPA — Clothes Dryer Safety tip sheet
What cleaning can and can't fix
Cleaning clears lint and debris from the transition duct, the vent run and the exterior hood. NFPA suggests doing it once a year, or more often if drying times grow, and USFA reports that failure to clean was the leading factor contributing to ignition in residential dryer fires in its 2008–2010 analysis.
Cleaning can't move a vent that ends under the home or correct a reverse slope. That's installation work, quoted separately only if offered, or handled by a qualified installer. Gas connections and electrical work are also outside a cleaning visit; NFPA advises having gas dryers inspected by a qualified professional. And no cleaning can guarantee against every dryer fire — it reduces one known risk factor.
Sources: NFPA — Clothes Dryer Safety tip sheet; U.S. Fire Administration — Clothes Dryer Fires in Residential Buildings (2008–2010), Topical Fire Report Series Vol. 13, Issue 7
Skirting, ventilation, and moisture under the home
Kentucky's guidelines explain that skirting helps keep cold air away from the space under the home, where the heat ducts and most of the plumbing are located. They also require ventilation openings in the skirting — at least one square foot of net open area for every 150 square feet under the home, with a reduced ratio allowed where a ground vapor barrier is installed and openings sit near each corner — and warn that without adequate ventilation, moisture can build up under the home and lead to high humidity, condensation, frost or ice in the home.
A dryer exhausting under the home works directly against that ventilation plan, which is one more reason the vent needs to end outside the skirting.