The Lennox X6673 (HCF20-11) is a high-performance MERV 11 replacement filter designed for the Healthy Climate air cleaner series. This 5-inch deep pleated media filter provides superior filtration efficiency compared to standard 1-inch disposables, significantly increasing the dust-holding capacity without causing excessive static pressure. It is engineered to capture 85% of particles down to 3 microns, including mold spores, pollen, and pet dander, while maintaining a high airflow rating of up to 2000 CFM. This makes it an ideal choice for contractors looking to protect HVAC system coils from debris accumulation and maintain peak thermal exchange performance.

The Lennox X6673 is identical to part number X667301 and serves as a direct OEM replacement for the HCC20-28 cabinet. Its robust construction features a specialized pleated media that ensures structural integrity at high velocities. With an actual size of 20 3/4" x 24 3/4" x 4 3/8", this filter offers a precise fit to prevent air bypass, ensuring all return air is properly treated before reaching the furnace or air handler.

Key Benefit List

• MERV 11 Efficiency: Captures over 85% of bioaerosols and larger contaminants to improve indoor air quality.
• Low Pressure Drop: Designed for high permeability, supporting system longevity and energy efficiency at 2000 CFM.
• Extended Service Life: High-capacity pleats allow for longer intervals between replacements compared to 1-inch filters.
• Cross-Brand Compatibility: Fits various systems from brands including Honeywell, Carrier, and Trion Air Bear using the same dimensions.
• Coil Protection: Prevents particle buildup on evaporator and heating coils to maintain system capacity.

Common Questions

Does the X6673 replace the X667301?
Yes, the Lennox X6673 and X667301 are identical parts and are fully interchangeable within the Healthy Climate housing.

Will this filter fit my 20x25 filter rack?
Check the actual dimensions versus your cabinet. While the nominal size is 20" x 25" x 5", the precise measurement is 20 3/4" x 24 3/4" x 4 3/8". Ensuring a snug fit is critical to prevent unfiltered air bypass.

How often should I replace this MERV 11 media?
In standard residential applications, replacement is typically required every 6 to 12 months, though high-load environments with pets or construction may require more frequent changes to maintain optimal airflow.

Item is Non Cancelable / Non Returnable

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.