Dryer vent installation: materials, length, elbows and termination
Use 4 in rigid or semi-rigid metal duct with a smooth interior, keep the run within the code or manufacturer limit (the model code limit is 35 ft, reduced for each elbow, unless the dryer maker allows longer), and terminate outside with a backdraft damper and no screen. Never vent into an attic, crawl space or wall cavity.
Cross-checked ~120 min moderateBrands: All
Before you start
- Lint fires: never use plastic or vinyl duct.
- Do not join duct sections with screws that stick into the airflow; they catch lint.
- Gas dryers: venting carries combustion products; never vent indoors.
Diagnostic steps
Unlock all 5 steps with expected values
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