Professional reviews from industry experts Filterbuy 21x24.5x5 Air Filter MERV 11, Pleated Replacement HVAC AC Furnace Filters for Rheem, Ruud, and Protech (2-Pack, Gold)
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| Brand | Filterbuy |
| Material | Synthetic |
| Item Dimensions LxWxH | 20.63 x 24.13 x 4.38 inches |
| MERV Rating | 11.00 |
| Compatible Device | Air Conditioner, Air Cleaner, HVAC System, Furnace |
- 21x24.5x5 replacement whole house air filters for your furnace, air conditioner, or HVAC system (actual size: 20.63 x 24.13 x 4.38 inches)
- Compatible Models: Rheem / Ruud Filter Part Numbers (PD540014, PD540020), Protech (540014, 540020), Housing Part Numbers (RXHF-E24AM10, RXHF-E24AM13)
- MERV 11 synthetic media (comparable with MPR 1000-1200 & FPR 7) protects homes from pets or allergies by trapping 95% of airborne particles without impacting air flow
- Electrostatically charged, pleated (100% US made) filters capture more harmful particles and last 3x longer than fiberglass models
- Industrial-grade beverage board (recyclable) frames with dual wire backings outperform standard cardboard designs
Product Description
21x24.5x5 AC Furnace Air Filters (MERV 11)
Dimensions and Filtration Effectiveness
The FilterBuy replacement whole house air filter 21x24.5x5 (actual measurements: 20.63" x 24.13" x 4.38") ensures that your furnace, air conditioner, or HVAC system is circulating clean air to help preserve your budget and sanitary lifestyle. MERV 11 synthetic media is recommended if you have additional filtration needs because of factors like pets or allergies with its capability to defend against 95% of airborne particles, protecting your home or business from smoke, smog, debris, lint, pollen, mold, dander, and other forms of dust without impacting air flow.
Compatible Models: Rheem / Ruud Filter Part Numbers (PD540014, PD540020), Protech (540014, 540020), Housing Part Numbers (RXHF-E24AM10, RXHF-E24AM13)
Construction and Design
High-quality construction features an electrostatically charged design with 12 pleats per foot that captures more harmful particles and exponentially prolongs the filter's lifespan. Plus, industrial-grade beverage board frames paired with dual wire backings improve structural integrity with their ability to endure heat up to 200° F while also withstanding exposure to moisture.
Installation and Material Sourcing
Installation is made simple with the inclusion of easy-to-understand arrows on the frame that help identify the direction of air flow and subsequently the way the filter needs to be placed. Additionally, all of our components are 100% manufactured within the United States and designed with reusable (synthetic) materials, providing a clean alternative to enhancing your air quality.
Key Takeaways
- Clean air helps prevent medical problems
- Regular filter replacements mitigate system malfunctions & reduce energy costs
- Filtration ratings are proficient without impacting air flow
- Electrostatic composition captures more harmful particles
- Pleated design increases surface area & length of effectivity
- Beverage board frames resist extreme temperatures
- Arrows on frames make installation easy
- All components are reusable & built domestically
 |  |  | |
|---|---|---|---|
| 21x24.5x5 MERV 8 Air Filters | 21x24.5x5 MERV 11 Air Filters | 21x24.5x5 MERV 13 Air Filters | |
| Package Quantity | 2 Pack | 2 Pack | 2 Pack |
| Recommended Use | Standard Residential / Commercial | Superior Residential / Commercial | Optimal Residential / Commercial (Hospital-Grade) |
| Comparable Rating System Metrics | MPR 600 & FPR 5 | MPR 1000-1200 & FPR 7 | MPR 1500-1900 & FPR 10 |
| Filtration Effectiveness | Traps 90% of Airborne Particles | Traps 95% of Airborne Particles | Traps 98% of Airborne Particles |
| Dust & Debris | ✓ | ✓ | ✓ |
| Mold & Pollen | ✓ | ✓ | ✓ |
| Lint & Dander | ✓ | ✓ | ✓ |
| Smog & Smoke | ✓ | ✓ | |
| Bacteria | ✓ |
Measuring and Replacing Your Air Filters
All air filters have a nominal size and an actual size. The nominal size is a shorthand number rounded to the nearest whole or half inch, normally in a larger font, that helps simplify the purchasing process (ex: 20" x 20" x 1"). Whereas the actual size is an exact measurement, normally in a smaller font, that depicts the precise dimensions of the filter (ex: 19.5" x 19.5" x .75").
If your current air filter does not have a dimension listed on the frame, grab a tape measure, and record the length x width x depth to find the actual size. You can then round these measurements to the nearest inch to find a corresponding nominal size, which will be easier to locate when searching online.
As a rule of thumb, we recommend replacing your filter every 90 days to keep your system running efficiently and your air clean. However, this is subject to change depending on the filter size as well as other variable factors for pet owners, allergy-sufferers, households with children, etc.
About Us
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Domestic ManufacturingFrom our first air filter sold in 2013, we have proudly built our business in the USA, now manufacturing in Alabama, Florida, Pennsylvania, and Utah. This robust network gives us the unique ability to quickly fulfill diverse, custom orders to households and businesses across the country. | Commitment to CommunityOur family-owned and operated company has evolved since its inception in 1958 to the filtration business that you know and love today. As our team has grown to nearly 1,000 employees, we have continued to keep our commitment to community investment and personal aid at every opportunity. | 600+ Custom Air Filter SizesWe now offer over 600 different custom air filter sizes, because we know that when it comes to clean air, there isn’t a one-size fits all solution. This ensures that we can complete our mission of providing you value with a quality product that is delivered directly to your door, regardless of your filtration needs. | Live & Breathe FreelyAt Filterbuy, we care about the air you breathe because we know how important it is to maintaining a sanitary lifestyle. This is why we work around the clock to assure that you, your family, and your community have access to clean indoor air that enables you to live and breathe freely. |
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