X6670 Lennox OEM Merv 11 Filter Media 16in x 25in x 5in - High

In this review the X6670 Lennox OEM Merv 11 media filter is evaluated for homeowners and service techs who need dependable furnace filtration that balances efficiency and lifespan. The bottom line: this genuine Lennox replacement offers MERV 11 performance and deep media depth so it captures fine particles, improves air quality, and reduces coil build-up for systems that accept 16in x 25in media modules. It is especially compelling when buying in bulk for routine maintenance or for multi-unit properties where value and fit matter.

Key Features

• Genuine OEM construction: Being a Lennox replacement filter ensures consistent fit and materials designed for Lennox media housings, which reduces installation fuss.
• MERV 11 efficiency: The filter media captures up to 98% of particles down to 0.3 microns, improving indoor air quality and helping protect downstream equipment.
• Deep media design: The nominal 5in media thickness provides more surface area for longer service life compared with thinner panel filters.
• Bulk pack value: Sold as a pack of four filters, it lowers per-filter cost and simplifies scheduled replacements for regular maintenance.
• Compact nominal size: The 16in x 25in x 5in nominal dimensions match common media housings, while the actual size is provided for verification before ordering.

Who It's For

This filter is a good fit for homeowners with Lennox media housings or compatible furnaces who want better-than-standard filtration without moving to a whole-home electronic system. It works well for families concerned about dust, pet dander, and finer airborne particles, and for technicians stocking parts for routine service calls.

It is less suitable for systems that require exact non-media drop-in cartridges or for users who need washable or reusable filters; also, buyers should verify the actual filter measurements before ordering because the actual size differs slightly from the nominal dimensions.

Pros & Cons

Pros

• High filtration efficiency captures small particles and improves indoor air quality.
• Genuine Lennox OEM build ensures predictable fit and performance in compatible housings.
• Four-pack format offers strong value and reduces purchase frequency for scheduled maintenance.
• Deep media thickness extends service life compared with thin panel filters.

Cons

• Actual dimensions are slightly smaller than nominal size, so buyers must verify fit before ordering.
• Not reusable; replacement frequency depends on home conditions and heating/cooling use.

Specifications

Brand	Lennox (Genuine OEM)
Nominal size	16in x 25in x 5in
Actual size	Approximately 15.65in x 24.65in x 4.31in
Efficiency rating	MERV 11 (captures particles down to 0.3 microns)
Pack quantity	Pack of 4 filters
Replaces	X6670 and fits HCF16-10, HCC16-28 compatible housings

Our Verdict

The X6670 Lennox OEM MERV 11 media filter is a sensible choice for anyone who wants reliable, higher-efficiency filtration in a compatible Lennox media housing. Its genuine construction, deep media and four-pack value make it a practical pick for homeowners and service professionals who prioritize air quality and reduced coil contamination, provided they confirm the actual measurements before purchase.

Frequently Asked Questions

Will this filter fit my system?
Check your media housing or existing filter actual measurements; the nominal size is 16in x 25in x 5in while the actual dimensions are slightly smaller.

How often should these be replaced?
Replacement depends on use and indoor conditions, but the deeper media typically lasts longer than thin panel filters; inspect every 3 months and replace as needed.

Is this a genuine Lennox part?
Yes, this is a genuine Lennox OEM media filter designed as a replacement for compatible Lennox media housings.