Do dryer vent booster fans work?

Dryer vent booster fans are devices installed in-line with a dryer’s exhaust vent to help increase airflow and venting efficiency. They can be useful in certain situations, but aren’t always necessary. Here’s a look at how dryer vent booster fans work, when you might need one, and some considerations when installing them.

How do dryer vent booster fans work?

A dryer vent booster fan is installed in-line with the exhaust vent, between the dryer and the outdoor vent termination. It works by using a fan to actively push air through the vent while the dryer is running. This helps increase airflow and venting velocity.

Without a booster fan, dryers rely solely on the natural draft created by rising hot air to pull air through the vent. However, there are some situations where this draft is not strong enough for adequate venting. Restrictions or long vent runs over 25-30 feet can reduce airflow. A booster fan supplements the natural draft to make sure there is strong, consistent airflow.

The increased airflow from a booster fan has a few main benefits:

• Helps exhaust more lint and moisture – Poor airflow allows lint and moisture to accumulate in the vent.
• Reduces drying times – Improved airflow allows clothes to dry faster.
• Lowers fire risk – Excess lint buildup increases the fire risk.
• Prevents overheating – Good airflow prevents overheating of the dryer.

When should you install a dryer vent booster fan?

Here are some situations where a dryer vent booster fan is recommended:

• Long vent runs – Installing a booster fan is recommended for vent runs longer than 25-30 feet. The increased length causes more air resistance and reduces natural airflow.
• Many elbows – Too many vent elbows also increase resistance. More than 2-3 elbows could benefit from a booster fan.
• Tight spaces – Boosters help overcome air resistance when vents are squeezed into tight spaces.
• High-efficiency dryers – HE dryers have more stringent venting requirements. A booster can help meet those requirements.
• Manufacturers’ instructions – Some dryer manufacturers recommend booster fans for certain installations.
• Existing vent problems – Boosters can help compensate for vents with pre-existing airflow issues.

You may also want to install a booster fan if your clothes are taking too long to dry or you notice lint buildup. Try cleaning the vent first, but a booster fan may be needed if problems persist.

Considerations when installing a dryer vent booster fan

Here are some important considerations when installing and operating a dryer vent booster fan:

• Proper location – The booster fan must be installed downstream of the dryer and upstream of the outdoor vent hood.
• Sufficient power – Choose a booster fan with enough power for your specific vent length and conditions.
• Plugs into dryer outlet – For automatic operation, the booster fan should plug into the dryer’s electrical outlet.
• Manual override – Models with manual switches let you turn the fan on independently to clear vent lint.
• Check air direction – Confirm the fan blows air in the proper direction, outbound through the vent.
• Inspect vent – The vent should be inspected and cleaned before installing the booster.
• Follow instructions – Carefully follow the installation instructions provided.
• Meet local codes – Make sure the installation complies with local building codes.
• Consider noise – Fan noise may be an issue in some locations.

With proper installation and maintenance, a dryer vent booster fan can provide the extra airflow needed in problem venting situations. Be sure to clean the entire vent regularly according to dryer manufacturer instructions.

How to install a dryer vent booster fan

Here is a basic overview of how to install a dryer vent booster fan. Be sure to refer to the manufacturer’s instructions for your specific model:

1. Turn off power to the dryer and disconnect it.
2. Remove the dryer vent connection to access the interior duct.
3. Position the booster fan housing in line with the vent ductwork.
4. Secure the housing in place with sheet metal screws.
5. Wire the booster fan motor to the electrical wiring.
6. Reconnect the dryer vent ductwork to the booster housing.
7. Plug the booster fan power cord into the dryer electrical outlet.
8. Reconnect power to the dryer and test that the booster fan activates when the dryer runs.
9. Confirm proper airflow direction and vent exhaust outside.

Installation is usually simplest on straight-line vents. Vent elbows or connectors may require some disassembly to properly install the booster housing. Follow all safety precautions when working with electrical wiring.

Types of dryer vent booster fans

There are two main types of dryer vent booster fans:

In-line booster fans

In-line booster fans are installed between the dryer and the vent hood outdoors. This is the most common type. They operate automatically when the dryer runs and help push lint and moisture out the vent.

Wall-mounted booster fans

Wall-mounted fans are installed on an exterior wall near the vent hood. They pull air from the vent to help draw airflow through it. Wall-mounted units require manual operation.

In-line booster fans tend to provide stronger, more consistent airflow. But wall-mounted units can be helpful in some installations where an in-line fan won’t fit.

How to choose the best dryer vent booster fan

Consider these factors when choosing the best type of dryer vent booster fan for your needs:

CFM airflows

Choose a booster fan with a CFM airflow rating appropriate for your vent length. Longer vents need higher airflow fans. Compare the CFM rating to the vent manufacturer’s recommendations.

Fan power type

• Electric fans – Best for easy automatic operation when plugged into the dryer outlet.
• Direct drive – Run directly off the dryer motor for automatic operation.
• Belt drive – Connect via a belt to the dryer blower wheel.

Construction

Look for sturdy metal construction of the fan’s housing. Plastic housings can present a fire hazard.

Safety features

Units with auto-reset thermal protection will shut down in event of overheating. Auto-reset allows normal operation once temperature decreases.

Automatic vs. manual operation

Automatic fans provide optimal convenience by operating whenever the dryer runs. Manual units require you remember to turn them on.

Noise level

If fan noise may be disruptive, compare noise ratings on different models and choose a quieter fan.

Price

Prices range from $50 up to $200+ for larger and more powerful in-line booster fans.

Top dryer vent booster fans

Here are some top-rated dryer vent booster fan models to consider:

Brand	Model	Type	CFM	Features
Deflecto	Supra QP	In-line	180	Quiet, auto reset thermal protection
Dundas Jafine	Pro Boost	In-line	192	Aluminum housing, plugs into dryer outlet
Imperial	IEDF85U	In-line	85	Lower cost, good for shorter vents
Deflecto	VAFL-6	Wall-mount	240	Manually operated, 9 ft. power cord

Troubleshooting dryer vent booster fans

If your dryer vent booster fan is not operating properly, try these troubleshooting tips:

• Check electrical connections – Make sure the fan is getting power.
• Test fan independently – Disconnect vent and test fan separately to isolate issue.
• Listen for sounds – Unusual sounds can indicate fan damage or blockage.
• Remove lint buildup – Excess lint can clog the fan impeller.
• Check vent routing – Make sure vent is not crushed or making sharp turns.
• Replace fan – If fan motor is defective, the unit may need replacement.
• Get professional help – For complex issues, contact a dryer vent service professional.

Routine maintenance like cleaning lint will help prevent many dryer vent booster fan problems. But fans exposed to moisture or dust may require occasional repairs or replacement.

Conclusion

Dryer vent booster fans can provide an effective solution for improving vent airflow in problem installations. The key is choosing the right type and size fan for your specific vent configuration. Proper installation is also critical for the booster fan to work correctly and reduce fire risks. With a quality booster fan properly maintained, you can rest assured your dryer’s venting system is operating safely and efficiently.