Lennox X6666 Filter

Professional-grade indoor air quality starts with the Lennox X6666 Healthy Climate Carbon Clean 16, a high-performance 17 x 26 x 4 media filter engineered specifically for the Lennox PureAir PCO-12C purification system. As a veteran-preferred MERV 16 replacement filter, this unit provides hospital-grade filtration by capturing over 95% of airborne particles down to 0.3 microns, including fine dust, mold spores, and bioaerosols. Unlike standard pleated filters, the Lennox X6666 is designed with a low initial resistance of approximately 0.10" w.g. at 1200 CFM, ensuring maximum HVAC system efficiency and airflow without overtaxing the blower motor. This OEM Lennox filter is the direct performance upgrade for the X6664 (MERV 11) model, offering superior contaminant removal for residential and light commercial air handlers. Technical specifications confirm an actual size of 16-5/8" x 26" x 4", ensuring a precise seal within the HCFPCO-12C housing to prevent air bypass and maintain peak static pressure balance.

Key Benefits

• Hospital-Grade Filtration: Certified MERV 16 rating ensures the removal of 95% of particles as small as 0.3 microns and 90% of particles down to 0.01 microns.
• Optimized Pressure Drop: Engineered for high-velocity systems with a low resistance design that protects the compressor and heat exchanger from airflow restriction.
• Carbon Clean Technology: Features a carbon-coated fiber matrix to assist in the reduction of odors and volatile organic compounds (VOCs).
• Direct OEM Fit: Guaranteed compatibility with Lennox Healthy Climate PCO-12C cabinets, replacing part numbers 100908-04 and 75X67.
• Extended Service Life: High-capacity pleat design typically requires replacement only every 6 to 12 months depending on the ambient air load.

Common Questions

Can I upgrade from a MERV 11 filter to this MERV 16 model?
Yes, the Lennox X6666 is the designated upgrade for the X6664. However, for PCO air purification systems, ensure the UVA lamps are properly shielded or replaced with the X8149 model, as MERV 16 media is sensitive to direct UV exposure.

What are the exact dimensions for the X6666?
While the nominal size is 17x26x4, the actual physical dimensions are 16-5/8" x 26" x 4". Always verify the cabinet clearance before installation to ensure a professional airtight fit.

How does this filter impact system static pressure?
Lennox engineers this media with a high surface area to keep initial resistance low (0.10" w.g.), making it one of the few high-efficiency filters that maintains HVAC system performance without significant pressure drops.

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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.