• Lennox 20x25x5 MERV-8 Furnace HVAC Filter | Part # X6673
    • Lennox 20x25x5 MERV-8 Furnace HVAC Filter | Part # X6673

    Lennox 20x25x5 MERV-8 Furnace HVAC Filter | Part # X6673

    Everyone else: $ 25.99"Everyone else" is defined as OEM (Original Equipment Manufacturer). Why pay the big brands prices when you can pay less? $ 22.99 & Free Shipping!

    If you are a meticulous person like me, then you would understand why using an air filter is one of the arsenals of protecting my family against invisible air pollutants. To make air filters more effective, having a replacement air filter on standby is necessary.

    Replacing the air filter in your whole house air purifier should be done every three to six months, and it should be checked regularly. You own the Lennox Healthy Climate, so keep your home clean and allergen free by maintaining and replacing the filters regularly, and keep your home air purifier working like it should.


    Designed to fit:

    • Lennox X6673
    • Lennox Healthy Climate whole home air purifier


    This is a replacement for:

    • Part nos. EXPXXFIL0020, EXPXXLMC0020, EXPXXUNV0020, F35 Expandapac, FC100A1037, FC200E1037, FC35A1027, FILCCCAR0020, HCF20-10, & HCXF20-10 



    • 20" x 25" x 5"


    Please note the following important information about this product from Think Crucial: (i) it is a generic replacement, NOT a Lennox® Original Equipment Manufacturer (OEM) product; (ii) because it is not a Lennox® OEM product, it is not covered by any Lennox® guarantee or warranty; (iii) use of this generic replacement may violate or void Lennox's® guarantee or warranty - it is entirely your responsibility to check, and entirely your risk if you decide to use this product; (iv) we do not guarantee or warrant that this generic replacement is compatible with any product from Lennox® or any other provider. Please check your manufacturer's warranty with regard to the use of non-OEM parts. Think Crucial provides no warranty or guarantee with regard to the product or its compatibility with your Lennox® product. The Lennox® brand and all Lennox® trademarks belong to Lennox® or its affiliates, and are used here only to explain the compatibility features of the generic replacement product.

    When will my order ship?

    Our warehouse ships Monday-Friday. If you place your order before 12pm EST, your order will ship out that same day. Orders placed after 12pm EST will ship the following weekday.

    What is your return policy?

    We want you to love what your ordered and we are confident that our products and service will help you live a healthier life. If something isn't right give us a call at 877.750.9239, 9am - 5pm (EST) Monday - Friday, or email us at If you are not 100% satisfied with your purchase, you can return it for a full refund (returns must be unused, in original packaging and within 30 days of your order date).

    How can I track my order?

    Thank you for your recent purchase with Think Crucial. When your order ships, you should receive an email with your tracking information. Please check your spam folder if you have not received it. Please feel free to contact us for further information regarding your order. Most of our packages are shipped using DHL Global Mail. DHL Global Mail's tracking information usually start with 92 and include 26 numbers. Our international orders are also shipped using DHL Global Mail, tracking numbers starting with GM. DHL Global Mail packages are transferred to USPS for the final mile delivery. Click here to for up-to-date information regarding your package's location. We also use USPS, UPS and Fedex to ship out our orders. Tracking information can be found on each companies respective website.
    - USPS's tracking number usually starts with 94 and include 22 numbers.
    - UPS tracking numbers usually start with 1Z and continue with 15 additional numbers.
    - Fedex tracking numbers start with either 61 and include 20 numbers or 59 and include 15 numbers.

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