Frigidaire FFMV1745TS Grease Filter Replacement – Step-by-Step Guide

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Grease Filter Replacement Guide

If your Frigidaire FFMV1745TS over-the-range microwave has decreased ventilation or grease accumulation, the grease filter likely needs cleaning or replacement. The grease filter traps cooking grease and prevents it from entering the ventilation system. A dirty or clogged filter is a fire hazard and reduces ventilation efficiency. This is an EASY maintenance task that should be done regularly.

Why Grease Filters Matter

Grease filters are critical for safety and performance:

  • Prevent grease from entering ventilation ducts (fire hazard)
  • Maintain proper airflow and ventilation efficiency
  • Reduce odors from cooking
  • Protect the ventilation fan motor from grease buildup
  • Required for proper operation of over-the-range microwaves

A clogged filter can cause the ventilation fan to work harder, reduce airflow, and create a fire hazard from accumulated grease.

When to Clean or Replace

Clean the filter monthly, or replace it if:

  • Filter is heavily coated with grease (can’t be cleaned effectively)
  • Filter is damaged, bent, or has holes
  • Filter is more than 6-12 months old
  • Ventilation is still poor after cleaning
  • Filter shows signs of deterioration

Parts Needed

  • Frigidaire 5304464105 Grease Filter (Part #: 5304464105)

Note: If your filter is just dirty, you can clean it instead of replacing. Only replace if it’s damaged or heavily soiled.

Tools Required

  • Dish soap or degreasing cleaner
  • Warm water
  • Soft brush or sponge (for cleaning)
  • Clean cloth or paper towels
  • Step stool or ladder (if needed to reach filter)

Step-by-Step Instructions

Step 1: Locate the Grease Filter

The grease filter is located on the bottom of the microwave, directly above the cooktop. It’s a metal mesh filter that slides out. Look for a release lever, button, or tab on the front edge of the filter.

Step 2: Remove the Filter

Press the release lever or pull the tab to release the filter. The filter should slide forward and down. Some models have filters that tilt down and then slide out. Pull the filter straight out, being careful not to spill any accumulated grease.

Step 3: Inspect the Filter

Examine the filter for:

  • Amount of grease buildup
  • Damage (bent, holes, or deterioration)
  • Clogging (grease blocking the mesh)
  • Overall condition

If the filter is heavily soiled or damaged, replace it. If it’s just dirty, proceed with cleaning.

Step 4: Clean the Filter (If Reusing)

If you’re cleaning the existing filter:

  • Fill a sink or basin with hot, soapy water
  • Submerge the filter completely
  • Let it soak for 15-30 minutes to loosen grease
  • Use a soft brush or sponge to gently scrub away grease
  • Rinse thoroughly with warm water
  • Allow to air dry completely before reinstalling

Important: The filter must be completely dry before reinstalling to prevent mold growth.

Step 5: Clean the Filter Housing

While the filter is removed, clean the filter housing area:

  • Wipe away any accumulated grease or debris
  • Clean the area where the filter sits
  • Remove any food particles or buildup
  • Ensure the housing is dry before reinstalling the filter

Step 6: Install the New or Cleaned Filter

If installing a new filter, remove it from the packaging. Position the filter so it slides into the housing correctly. The filter should slide in smoothly and lock into place. You may hear a click when it’s properly seated. Ensure the filter sits flush and is properly aligned.

Step 7: Verify Installation

Check that the filter:

  • Is properly seated and locked in place
  • Sits flush with the bottom of the microwave
  • Doesn’t wobble or move when touched
  • Is properly aligned (not crooked)

Step 8: Test Ventilation

Turn on the ventilation fan and verify it operates properly. The fan should run smoothly without excessive noise. Airflow should feel strong. If ventilation is still poor after cleaning/replacement, check the charcoal filter (if using recirculating mode) or inspect the ventilation ductwork.

Maintenance Schedule

To keep your grease filter working properly:

  • Clean monthly if you cook frequently
  • Clean every 2-3 months for light use
  • Replace every 6-12 months depending on use
  • Check the filter more often if you notice reduced ventilation
  • Clean immediately if you notice excessive grease buildup

Troubleshooting

If ventilation is still poor after cleaning/replacement:

  • Check the charcoal filter (if using recirculating mode)
  • Inspect the ventilation fan for damage or obstruction
  • Check the ventilation ductwork for blockages
  • Verify the microwave is set to the correct ventilation mode
  • Ensure the exterior vent cover (if vented outside) is not blocked

Fire Safety Warning

A clogged or dirty grease filter is a FIRE HAZARD. Grease buildup can ignite if exposed to high heat. Never operate your microwave with a heavily soiled filter. Regular cleaning is essential for safety.

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