How to Improve Microwave Exhaust Fan?

The exhaust fan in a microwave serves to ventilate and remove excess heat, steam, and odors generated during cooking. It helps maintain a comfortable kitchen environment by expelling cooking byproducts and preventing the accumulation of moisture inside the microwave, ensuring efficient and safe operation.

If your microwave’s exhaust fan seems weak or loud, there are a few easy things you can do to improve its performance. A well-functioning exhaust fan is important for removing smoke, steam, odors and moisture from your kitchen when cooking.

A properly functioning microwave exhaust fan is essential for clearing away smoke, grease, odors, and excess moisture when cooking. However, many homeowners tolerate weak or noisy fans that fail to get the job done.

This comprehensive guide will walk you through simple maintenance tasks, troubleshooting tips, and upgrade options to dramatically improve your microwave exhaust fan’s performance.

Basic Maintenance for Optimal Performance

The first step towards boosting your microwave ventilation is regular basic maintenance. Follow these tips:

  • Clean fan filters monthly – Built-up grease on the fan filter reduces airflow. Remove and hand wash in hot, soapy water. Alternatively, place in the dishwasher. Let the filter dry out completely before reinstalling to prevent moisture damage.
  • Use the highest fan setting when cooking – The fan works best on high when you need maximum smoke and odor removal. Use lower settings for light steaming or warming food only.
  • Check the damper flaps – Located where the ductwork connects, the damper flaps should move freely when the fan turns on, then close tightly when off. A stuck open flap allows air to escape. Stuck closed, and no air flows. Lightly coat stubborn flaps with cooking oil to loosen.
  • Wipe down the fan housing – Grease splatters inside the housing can build up over time. Unplug the microwave and use mild detergent and warm water for a basic wipe down every 6 months.
  • Replace old filters – Fan filters lose effectiveness after prolonged use. Check your owner’s manual for the recommended replacement timeframe. Typically, this is every 6-12 months.

Take just a few minutes each month to follow this basic maintenance routine. Not only will it improve day-to-day ventilation, but it extends the life of your exhaust fan as well.

Troubleshooting Tips for Common Issues

In addition to regular maintenance, pay attention to any new noises, smells or lack of airflow that could indicate a underlying problem. Here are some common exhaust fan issues and potential DIY fixes:

Excess Noise

  • A grinding, rattling or buzzing fan often means a build up of grime. Thoroughly clean all filters, housing and ductwork. Replace any filters in poor condition.
  • Check for obstructions like small objects or nesting insects impeding the fan blades. Unplug before carefully removing any debris.
  • Worn out motor mounts can cause vibration and noise. Replacing these inexpensive rubber grommets may help quiet things down.

Weak Airflow

  • Clean or replace clogged filters so air can pass through unobstructed.
  • Spray cooking oil on the damper flaps if they stick when opening.
  • Use a duct brush or compressed air to remove stuck-on grease in the ductwork that narrow air passages.

Lingering Odors

  • Clean the fan, filters, and ducts thoroughly to eliminate trapped food odors. You may need a degreaser for tough buildup.
  • Check the duct connection for gaps that allow odors to escape back into the kitchen. Seal any leaks with metal tape.
  • If odors persist despite a thorough cleaning, the fan housing, blower wheel or internal ductwork may need replacing.

By methodically assessing and addressing each potential issue, you can resolve common exhaust fan problems yourself without costly handyman or replacement fees.

When To Call In A Professional

While the maintenance tips above can resolve many issues, there are some situations where it’s best to let a technician handle things:

  • Ductwork that’s difficult to access or reach. Professionals have specialized tools to clean long duct runs or awkward spaces.
  • Major grease buildup. Although you can tackle minor grease in the housing, excessive saturated grease needs commercial-strength degreasers and proper disposal.
  • Electrical issues. A fan not turning on at all requires electrical troubleshooting you should not attempt yourself.
  • Structural problems. A professional can determine if sagging, detached or damaged ductwork needs replacing.
  • Unresolved noise or odor. If thorough DIY efforts don’tresolve perpetual noise or smell, there may be underlying damage needing repair.
  • Installation help. Technicians have the skills to safely mount or replace microwave exhaust fans.

When diagnosing complex ventilation issues or attempting risky access, hire a qualified handyman or HVAC company. Paying for professional assistance can save money and hassle in the long run.

Upgrade Options for Improved Ventilation

If your microwave exhaust remains lackluster despite your best maintenance and troubleshooting efforts, it may be time for an upgrade. Here are a few options:

  • Increase CFM rating – CFM relates to the air movement capacity. A higher CFM fan clears more smoke and odors. Increase this if your current microwave fan seems anemic.
  • Add ducting – Convert recirculating fans to vented by installing ductwork to the outside. This removes, not just filters, cooking byproducts.
  • Install larger fans – Larger fan blade spans push more air. Measure your microwave shelf before purchasing to ensure proper fit.
  • Quieter technology – New fan designs better muffle noise. Look for models with multiple fan speeds and “silent” settings.
  • Built-in vs freestanding – Built-in fans mounted into cabinetry tend to circulate air better for that space than freestanding models.
  • Smart technology – Some new microwave fans sync to ventilation needs or even ventilation systems. Look for “smart” features.

With good measurements and planning, upgrading your exhaust fan is a doable DIY project. Or, hire an installer for seamless integration of your new kitchen ventilation system.


Don’t tolerate a subpar microwave exhaust fan in your kitchen. With a focus on regular maintenance, DIY troubleshooting, and upgrades when needed, you can dramatically improve ventilation performance.

Be sure to use the highest fan setting when cooking to clear smoke and odors most effectively.

Follow the tips above to optimize airflow, reduce noise, eliminate odors, and promote kitchen comfort and cleanliness. With just a little effort, your microwave exhaust can work like new.

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