Lennox X6670 MERV 11 16x25x5 Box Replacement Filter - 3-Pack

In this review the Lennox X6670 MERV 11 16 x 25 x 5 box replacement filter (case of 3) is evaluated for homeowners and maintenance pros who need dependable, higher-efficiency filtration for furnaces and HVAC systems. The bottom line: this pack offers a practical combination of consistent fit and effective particle capture for homes that need better air quality without specialty sizing headaches, provided you verify the actual cabinet dimensions before purchase.

Key Features

• MERV 11 filtration: Captures finer airborne particles than basic fiberglass filters, improving indoor air quality around pets and dust sources.
• Actual and nominal sizing noted: The filters have both Nominal Size and Actual Size printed, which helps confirm fit when replacing existing filters.
• Manufactured in North America: Buyers get local production standards and consistent build quality across the three filters in the case.
• Case of 3: Provides multiple replacement cycles up front, offering convenience and potential savings compared with single packs.
• Easy installation cues: The arrows and printed sizes make orientation and placement straightforward for most users.

Who It's For

The Lennox X6670 MERV 11 is best for homeowners and renters who run central furnaces or HVAC systems that accept a 16 in x 25 in x 5 in filter and who want better filtration for dust, pet hair and common allergens without moving to a very high restriction media. It fits well for seasonal maintenance or for people who prefer keeping multiple replacements on hand.

It is not the right choice for systems that require nonstandard actual sizes or very high MERV ratings for clinical environments. If the filter cabinet measures differently than the printed actual size, or if the system requires a thicker or thinner media, those buyers should measure precisely and select a matching model.

Pros & Cons

Pros

• Good balance of filtration and airflow with MERV 11, improving indoor air quality without excessive restriction.
• Clear printed Nominal and Actual sizes plus orientation arrow make installation quick and reduce guesswork.
• Case of 3 offers value and convenience for routine filter replacement schedules.
• Manufactured in North America, which contributes to consistent build quality across the pack.

Cons

• Actual sizes can vary by brand; buyers must measure the filter cabinet to ensure a proper fit before purchasing.
• The 5 in depth may not be compatible with all furnaces that accept different depths or custom slots.

Specifications

Brand	HEALTHY CLIMATE (Genuine Lennox Healthy Climate)
Model / Part	X6670 / HCF 16-11
Nominal / Actual Size	16 in x 25 in x 5 in (actual sizes printed on unit)
MERV Rating	MERV 11
Quantity	Case of 3
Manufactured	North America

Our Verdict

The Lennox X6670 MERV 11 16 x 25 x 5 3-pack is a solid, practical choice for most residential HVAC systems that accept a 5 in depth filter and seek improved air filtration without major airflow penalties. It is good value when you want multiple replacements at once and appreciate clear sizing and installation cues, though buyers should confirm the cabinet's actual dimensions before ordering.

Frequently Asked Questions

Will this filter fit my furnace?
Check the inside of your filter cabinet and compare to the Actual Size printed on the filter; the unit is 16 in x 25 in x 5 in nominal with actual size noted on the media.

How many filters are included?
This listing is a case of 3 filters, providing multiple replacement cycles.

What level of filtration is provided?
The filter is rated MERV 11, which captures finer particles like dust, pollen and pet dander while maintaining reasonable airflow for most home systems.