Home › Dryers › Parts › Exterior vent hood

Dryer Exterior vent hood: What It Does and Signs It's Failing

The vent hood is the cap on the outside wall or roof where the dryer exhaust comes out. It has a damper flap that opens when the dryer runs and falls shut when it stops. It's the last stop for lint in the system.

How it works

Air pressure from the blower pushes the flap open. Lint builds up on the flap and in the opening, and in winter snow and ice can hold it shut. A flap that can't open makes the whole vent act blocked.

Signs it is failing

• Flap stays shut or barely moves while the dryer runs
• Lint caked on the hood
• Weak air when you hold your hand under it
• Snow or ice around the opening

Airflow and check-vent codes can come from a hood that's stuck shut even when the duct behind it is clean.

Can you replace it yourself?

Run the dryer for 5 to 10 minutes and hold your hand under the hood. Whirlpool says the flow should feel at least as strong as a hair dryer on high; if it doesn't, clean out the hood and the full duct run. If you're replacing a hood high on the wall or on the roof, hire it out rather than working off a ladder.

Buying the right part

Get a hood with a 4 in (10 cm) opening and a damper. GE wants it at least 12 in (30 cm) above the ground or any obstruction, with the opening facing down.

Error codes linked to the exterior vent hood

• Check VentLow airflow: the vent is likely blockedGE
• d80Exhaust vent is restricted (Flow Sense)LG
• ClgVent clogged (vent test result)Samsung
• AF / F4E3Restricted airflow: lint screen or vent blockedWhirlpool

Last reviewed 2026-10-19.