When your HVAC system struggles to keep indoor air fresh, the culprit is often a clogged or low-quality filter. For homeowners with Lennox or compatible systems, finding the right 20x25x5 filter is essential. In this guide, we evaluate two top contenders: the Filtrete MPR 1000 MERV 11 filter and the BestAir Advanced Allergen MERV 11 filter. Whether you prioritize allergen capture or energy savings, we break down what matters most for your home in 2026.
If you are looking for standard 1-inch filters, check out our top 20 x 25 x 1 furnace filters for other options.
Pros
- Excellent particle capture for allergies and asthma
- Long 12-month lifespan means fewer replacements
- Fits Lennox systems securely and is easy to install
- Sturdy construction with electrostatic pleated material
- Good value with 2-pack pricing
Cons
- Actual dimensions slightly smaller than nominal (19.63 x 24.75 x 4.31 inches)
- May require weather stripping for a perfect seal in some furnaces
- Not ideal for systems needing a thinner filter (under 4.31 inches)
The Filtrete 20x25x5 MPR 1000 filter from 3M is a high-performance HVAC filter designed for homeowners who want cleaner indoor air. It is specifically compatible with Lennox systems and other setups that accept a 5-inch thick filter, making it a go-to choice for allergy sufferers and pet owners.
With a MERV 11 rating and Filtrete's exclusive 3-in-1 technology, this filter captures up to twice as many microparticles as standard MERV 11 filters. In real-world use, users report noticeable reductions in dust, pet dander, and allergy symptoms. The 12-month lifespan is a standout feature, simplifying maintenance and offering long-term value.
Build quality is solid, with a sturdy pleated polypropylene construction that holds its shape during installation. The electrostatic charge helps attract particles, and the filter slides easily into most standard slots. However, some users note that the actual dimensions are slightly smaller than the nominal 20x25x5 inches, which may affect fit in certain furnaces.
A potential drawback is that the filter may not seal perfectly in every system, requiring additional weather stripping to prevent air bypass. Also, it is not suitable for systems that require a thinner filter. These issues are minor for most users but worth checking before purchase.
Overall, the Filtrete MPR 1000 filter delivers on its promise of cleaner air and allergy defense. It is a reliable, cost-effective choice for homeowners willing to invest a bit more for superior filtration. We highly recommend it for Lennox systems and anyone prioritizing indoor air quality.
Pros
- Excellent balance of filtration and airflow.
- Compatible with a wide range of specific air cleaner models.
- Positive customer feedback on fit and performance.
- Made in the USA for consistent quality.
- Three-pack offers good value for periodic maintenance.
Cons
- Not a standard 1-inch filter; requires compatible 5-inch deep filter housing.
- Some users note the thickness is slightly less than expected.
- Limited compatibility may not fit all furnaces or air handlers.
The BestAir 20x25x5 MERV 11 3-pack is a specialized air filter designed for use with Air Bear, Supreme, Skuttle, GeneralAire, and other compatible HVAC air cleaners. It is specifically optimized for models requiring a 5-inch deep filter, which means it is not a standard 1-inch filter. This filter is ideal for homeowners who want to improve indoor air quality without placing additional strain on their heating and cooling systems.
Standout features include a MERV 11 rating that targets common allergens like pollen, dust mites, and pet dander, while the construction minimizes airflow resistance. This careful balance helps the HVAC system run efficiently, which can lead to lower energy bills and reduced wear over time. Customer reviews highlight that the filter fits perfectly in compatible models, making replacement straightforward.
Build quality is solid, with a sturdy frame and dense media that hold shape even with consistent airflow. The filter is made in the USA, which adds to its overall appeal for buyers looking for domestic production. The actual dimensions (19.75x24.25x4.88 inches) are accurate, according to users, so ensure your filter slot matches these measurements before ordering.
However, a few caveats exist. Some users noted the filter thickness felt slightly less than their previous unit (though it still fits correctly). Additionally, this filter is designed for specific 5-inch deep systems, not generic 1-inch systems, which limits compatibility. Potential buyers should verify their system brand and model to avoid sizing issues.
Overall, the BestAir 20x25x5 MERV 11 3-Pack offers excellent filtration performance with minimal impact on HVAC efficiency. For owners of Air Bear, Supreme, Skuttle, GeneralAire, Source1, or Braeburn air cleaners, this is a top-notch replacement option that blends performance, build quality, and solid value.
Brand: BestAir
Model: AB2025-11R
Filter Size: 20x25x5 inches (actual 19.75 x 24.25 x 4.88 inches)
MERV Rating: 11
Material: Polyolefin
Pack Size: 3 filters
Compatible Systems: Air Bear (Supreme 2000, 435790-027, etc.); Skuttle (DB0-0025-020); GeneralAire (MAC2000); Source1 (S1-MAC102025000); Ultravation (90-007); Braeburn (162025, 162026); Braeburn (162025, 162026)
Manufacturer: RPS Products
Country of Origin: USA
Buying Guide
MERV Rating and Filtration Efficiency
MERV 11 filters capture particles as small as 1.0 micron, including dust, pollen, mold spores, and pet dander. Both the Filtrete and BestAir models meet this standard, but Filtrete adds a Microparticle Performance Rating (MPR) of 1000, which indicates superior capture of sub-micron particles. For allergy sufferers, this extra layer of filtration can make a noticeable difference.
When comparing filters, always verify the actual dimensions. The Filtrete filter measures 19.63 x 24.75 x 4.31 inches, while the BestAir is 19.75 x 24.25 x 4.875 inches. A snug fit prevents unfiltered air from bypassing the media.
Compatibility with HVAC Systems
Not all 20x25x5 filters fit every system. The Filtrete filter is designed specifically for Lennox multimedia systems, while the BestAir is optimized for Air Bear models like the Supreme 2000, as well as Skuttle and GeneralAire units. Always check your system’s manual or measure the existing filter slot before purchasing.
If you are unsure about your system type, our Air Filters category page offers more guidance on finding the right fit.
Longevity and Replacement Schedule
Thicker 4-inch filters typically last longer than 1-inch versions, often up to 12 months. The Filtrete filter is rated for annual replacement, and its companion app helps you set reminders. The BestAir 3-pack provides a three-year supply if replaced yearly, offering convenience and cost savings over time.
High-efficiency filters can restrict airflow if not changed on schedule, so set a calendar reminder or use the app to stay on track.
Energy Efficiency and Pressure Drop
Filters with higher MERV ratings can increase static pressure, forcing your HVAC blower to work harder. The BestAir filter is engineered for minimal pressure drop, which helps conserve energy and reduce operating costs. The Filtrete filter balances high filtration with good airflow, but for maximum energy savings, the BestAir may be the better choice.
Consider your local climate and how often your system runs. In milder seasons, a filter with slightly higher pressure drop is less of a concern.
Final Thoughts
Choosing between these two excellent filters comes down to your specific system and priorities. For Lennox systems and superior allergen capture with smart reminders, the Filtrete – Filtro de aire para aire acondicionado is our top recommendation. If you need a three-pack for an Air Bear or similar unit and prioritize energy efficiency, the BestAir 20x25x5 Air Filter MERV 11 Advanced offers great value and performance. Both will keep your home’s air cleaner and your HVAC running smoothly throughout 2026.
Frequently Asked Questions
How often should I replace a 20x25x5 MERV 11 filter?
Most 4-inch thick filters last up to 12 months, but check your filter every three months. If you have pets or allergies, you may need to replace it sooner. The Filtrete filter includes a smart app to remind you when it is time.
Will a MERV 11 filter fit my Lennox system?
The Filtrete MERV 11 filter is specifically designed for Lennox multimedia systems. Always measure your existing filter slot; the actual dimensions are 19.63 x 24.75 x 4.31 inches. For other brands, check compatibility before ordering.
What is the difference between MERV 11 and MERV 13?
MERV 13 captures smaller particles (0.3 to 1.0 microns) than MERV 11 (1.0 to 3.0 microns), but it also creates more airflow resistance. For most homes, MERV 11 provides excellent filtration without overtaxing the HVAC system. If you need higher filtration, consult your system’s manual first.
Can I use a 20x25x5 filter in a 1-inch slot?
No, a 4-inch filter will not fit in a 1-inch slot. The thickness is different, and using the wrong size can cause air leaks or damage. Stick to the size specified by your HVAC manufacturer. For standard 1-inch filters, see our best 20 x 25 x 1 furnace filters guide.
Write Your Review
No reviews yet. Be the first to share your experience!