How to Clean a Dryer Vent

Reduce drying time and fire risk by cleaning the lint path from the dryer outlet to the exterior termination.

Difficulty: IntermediateTime: 45–120 minutesTypical cost: $20–$50

Safety first: Disconnect electric power before moving or servicing the dryer. For a gas dryer, avoid stressing the gas connector and use a qualified technician if movement is unsafe.

In this guide

Symptoms
Likely causes
Tools and materials
Step-by-step procedure
Common mistakes
When to call a professional

Common symptoms

Clothes take longer to dry
The dryer or laundry room feels unusually hot
A burning or dusty odour occurs
Little air exits the exterior vent

Likely causes

Start with the simplest observable cause and avoid replacing parts until the failure has been identified.

Lint accumulation
A crushed transition duct
Excessive duct length or bends
A stuck exterior damper
Bird or pest nesting

Tools and materials

Dryer vent brush kit
Vacuum
Screwdriver or nut driver
Work gloves

Step-by-step procedure

Unplug the dryer. If gas-connected, inspect whether it can be moved without straining the connector.
Disconnect the transition duct and vacuum loose lint from the dryer outlet and duct.
Clean the rigid vent run from the accessible end using a correctly sized brush, following the kit instructions.
Clean the exterior termination and verify that its damper moves freely. Do not install a screen that traps lint.
Replace crushed, plastic or foil accordion ducting with code-compliant metal transition duct where required.
Reconnect the duct without sharp bends and restore power.
Run the dryer on air-only and confirm strong airflow at the exterior.

Field tip: Record a baseline drying time after cleaning; a later increase can signal renewed restriction.

Common mistakes to avoid

Operating the dryer with the vent disconnected indoors
Using screws that project into the duct and collect lint
Leaving a crushed transition hose
Ignoring a gas connector under tension

Verify the repair

Test the repaired component through several normal operating cycles. Watch, listen and feel for leaks, heat, movement, unusual noise or odour. Stop immediately if the condition worsens. Document the work and retain part numbers, receipts and manufacturer instructions for future maintenance.

When to call a professional

Hire a vent-cleaning or appliance professional for long concealed runs, roof terminations, inaccessible ducts, gas-connection concerns or persistent overheating.

Editorial note

This guide is written for general homeowner education. Building codes, product instructions, warranties, condominium rules and licensing requirements vary. The safest compliant method for your property always takes precedence.