June 12, 2026 · 5 min read
Why second-floor venting is different
A second-floor dryer almost always means a longer run, more elbows, or a roof termination — all three add risk if planned poorly.
Routing options that work
Pick the shortest viable path to an exterior wall.
- Direct side-wall termination through the gable end
- Down through an interior wall to the rim joist
- Up and out through the roof with a dedicated cap
When to add a booster fan
Any run that exceeds the maximum developed length (35 feet minus penalties for elbows) needs a listed dryer booster fan to keep airflow safe and clothes drying in a single cycle.
Related service
Dryer Vent Installation
Code-compliant dryer vent runs installed cleanly the first time.
See Dryer Vent Installation details