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Furnace & HVAC Filters

Furnace & HVAC Filters

Shop furnace and HVAC replacement filters for residential and light-commercial heating and cooling systems. Furnace Part Source carries standard and high-efficiency filters by size, MERV rating, and equipment model to help support airflow and indoor air quality.

Use the product list below to find the correct filter by dimensions, MERV rating, or equipment model. Always confirm filter size and airflow direction before ordering to help ensure proper fit and performance.

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    Lennox X8788 MERV 16 Pleated Filter 20x26x5

    Lennox

    MSRP: $280.66
    Now: $216.88
    MERV 16 Pleated Filter 20x26x5   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $280.66
    Now: $216.88
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    MSRP: $280.66
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    Lennox X8310 MERV 10 Replacement Filter

    Lennox

    MSRP: $57.83
    Now: $44.69
    MERV 10 Replacement Filter  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $57.83
    Now: $44.69
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    Lennox X8309 MERV 10 16x25x5 Filter

    Lennox

    MSRP: $55.16
    Now: $42.62
    MERV 10 16x25x5 Filter  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $55.16
    Now: $42.62
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    MSRP: $55.16
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    Lennox X7935 20X20X5 MERV 16 Filter

    Lennox

    MSRP: $182.95
    Now: $141.37
    Lennox X7935   20X20X5 MERV 16 Filter   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $182.95
    Now: $141.37
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    MSRP: $182.95
    Now: $141.37
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    Lennox X6675 20x25x5 MERV 16 Replacement Filter

    Lennox

    MSRP: $195.76
    Now: $151.27
    20x25x5 MERV 16 Replacement Filter   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $195.76
    Now: $151.27
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    MSRP: $195.76
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    Lennox X6673 20x25x5 MERV 11 Filter

    Lennox

    MSRP: $51.91
    Now: $40.11
    20x25x5 MERV 11 Filter  Item is Non Cancelable / Non Returnable FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No...
    MSRP: $51.91
    Now: $40.11
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    MSRP: $51.91
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    Lennox X6670 Media Air Filter MERV10

    Lennox

    MSRP: $42.39
    Now: $32.75
    Media Air Filter MERV10   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $42.39
    Now: $32.75
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    MSRP: $42.39
    Now: $32.75
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    Lennox X6669 MERV 16 Filter FOR PCO20-28

    Lennox

    MSRP: $367.98
    Now: $278.78
    MERV 16 Filter FOR PCO20-28  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $367.98
    Now: $278.78
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    MSRP: $367.98
    Now: $278.78
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    Lennox X6667 Filter 21x26x4 MERV 10

    Lennox

    MSRP: $54.50
    Now: $42.11
    Filter 21x26x4 MERV 10   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $54.50
    Now: $42.11
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    MSRP: $54.50
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    Lennox X6666 MERV 16 17 X 26 X 4" Filter

    Lennox

    MSRP: $297.30
    Now: $225.23
    MERV 16 17 X 26 X 4" Filter   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $297.30
    Now: $225.23
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    MSRP: $297.30
    Now: $225.23
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    Lennox X6664 16.5x26x4 MERV10 Media Filter

    Lennox

    MSRP: $43.82
    Now: $33.86
    16.5x26x4 MERV10 Media Filter   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $43.82
    Now: $33.86
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    MSRP: $43.82
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    Lennox X5425 28X17X6 MERV 16 Media Filter

    Lennox

    MSRP: $241.16
    Now: $182.70
    28X17X6 MERV 16 Media Filter  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $241.16
    Now: $182.70
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    MSRP: $241.16
    Now: $182.70
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    Lennox X5424 MERV 16 Replacement Filter

    Lennox

    MSRP: $286.90
    Now: $221.70
    MERV 16 Replacement Filter   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $286.90
    Now: $221.70
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    MSRP: $286.90
    Now: $221.70
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    Lennox X1152 Air Bearing Media Filter 20x25x5MERV10

    Lennox

    MSRP: $65.87
    Now: $50.90
    Air Bearing Media Filter 20x25x5MERV10  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $65.87
    Now: $50.90
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    MSRP: $65.87
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    Lennox X0587 BMAC-20CE MERV10 20x26x5

    Lennox

    MSRP: $55.28
    Now: $42.71
    BMAC-20CE MERV10 20x26x5   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $55.28
    Now: $42.71
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    MSRP: $55.28
    Now: $42.71
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    Lennox X0586 20x25x5 MERV10 Filter

    Lennox

    MSRP: $41.83
    Now: $32.32
    20x25x5 MERV10 Filter   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $41.83
    Now: $32.32
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    MSRP: $41.83
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    Lennox X0585 20x20x5 MERV 10 Filter

    Lennox

    MSRP: $51.48
    Now: $39.78
    20x20x5 MERV 10 Filter  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $51.48
    Now: $39.78
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    MSRP: $51.48
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    Lennox X0584 16x26x5 MERV 10 Air+D4381 Filter

    Lennox

    MSRP: $55.04
    Now: $42.53
    16x26x5 MERV 10 Air+D4381 Filter  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $55.04
    Now: $42.53
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    MSRP: $55.04
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    Lennox X0581 Media Filter 12 MERV 16X25X3

    Lennox

    MSRP: $36.55
    Now: $28.24
    Media Filter 12 MERV 16X25X3  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $36.55
    Now: $28.24
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    MSRP: $36.55
    Now: $28.24
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    Lennox X0445 MERV 10 25X20X6 Media Filter

    Lennox

    MSRP: $70.64
    Now: $54.58
    MERV 10 25X20X6 Media Filter   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $70.64
    Now: $54.58
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    MSRP: $70.64
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Furnace & HVAC Filters

Air filters remove dust, debris, and particulates from the air moving through a furnace or HVAC system, protecting internal components while supporting indoor air quality. A clogged or incorrectly sized filter can restrict airflow and reduce system efficiency.

Furnace Part Source carries a selection of furnace and HVAC filters in standard sizes and MERV ratings for residential and light-commercial equipment.

Common Filter Types We Carry

Common filter options include:

  • Standard pleated filters for everyday dust and debris capture.
  • Higher MERV-rated filters for improved filtration of finer particles.
  • Equipment-specific filters sized for particular furnace or air handler models.

How to Find the Right Filter

Before ordering, confirm the exact filter dimensions (length, width, and depth) either from the existing filter or the equipment's filter slot. Also check the recommended MERV rating for your system, since some HVAC equipment has airflow limitations that restrict how high a MERV rating can be used.

For best fit, compare:

  • Filter dimensions (length x width x depth)
  • MERV rating
  • Airflow direction arrow on the filter frame
  • Equipment model, if using an OEM-specific filter

Replacing Your Furnace or HVAC Filter

Regular filter replacement helps maintain airflow, protect the blower motor, and support consistent indoor air quality. Check filters monthly and replace them according to the manufacturer's recommended schedule or sooner if visibly dirty.

Need Help Choosing a Filter?

Not sure which filter size or MERV rating you need? Check the existing filter or the filter slot in your equipment, or contact Furnace Part Source for help identifying the correct replacement.

HVAC Filter FAQs

How often should I change my furnace filter?

Most furnace filters should be checked monthly and replaced every one to three months, depending on usage, filter type, and household conditions such as pets or allergies.

What does MERV rating mean?

MERV (Minimum Efficiency Reporting Value) measures how effectively a filter captures particles. Higher MERV ratings capture smaller particles but may increase airflow resistance, so confirm your system supports the rating you choose.

Can a dirty filter damage my furnace?

Yes. A clogged filter restricts airflow, which can cause the system to overheat, reduce efficiency, and place added strain on the blower motor and heat exchanger.

Which way does the airflow arrow on a filter go?

The airflow arrow should point in the direction air travels through the system, typically toward the blower or air handler. Installing a filter backward can reduce filtration efficiency.