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Actual Size: 13.25x13.25x1"

3 month filters
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Made in the USA
Ships in 24 hours
Available In MERV Rating: 8, 11, 13
Made in the USA
Ships in 24 hours
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MERV 8 | MERV 11 | MERV 13 | |
|---|---|---|---|
| Best for | Standard Residential/Commercial Healthy Families | Superior Residential/Commercial Allergy Sufferers | Optimal Residential/Commercial Hospital Grade |
| Comparable ratings | MPR 600 & FPR 5 | MPR 1000-1200 & FPR 7 | MPR 1500 - 1900 & FPR 10 |
| Filtration | Captures 90% of Airborne Particles | Captures 95% of Airborne Particles | Captures 98% of Airborne Particles |
| Dust, lint & debris | |||
| Mold, pollen | |||
| Dander, dust mites | |||
| Smoke & Smog | |||
| Bacteria | |||
| Odor, vocs |
Generally, we recommend you replace your air filters every 90 days. Find out below if you should change your filters more often.

Change your filter every
6 weeks
to ensure indoor air quality is at its best.

Change your filter every
2 months
to avoid shedding and odor buildup.

Change your filter every
2-3 months
as having clean air is even more important with children in your home.

Change your filter every
6 weeks
to ensure indoor air quality is at its best.

Change your filter every
2 months
to avoid shedding and odor buildup.

Change your filter every
2-3 months
as having clean air is even more important with children in your home.
The right air filter can make a noticeable difference in a home’s air quality, especially for allergy sufferers. Upgrading to a high quality electrostatic air filter can deliver big relief. These filters work by using static electricity to attract and trap dust, pollen, pet dander, and other irritants, all without breaking the bank. In this guide, we’ll walk you through why this affordable solution works so well and how it compares to traditional filters.
Great for dust, pollen, pet dander, and mold spores.
Custom-sized for a better fit. Filterbuy makes precision-fit filters for optimal performance.
Designed to perform without inflating your energy bills or your budget.
Built with premium U.S. materials.
According to the EPA, indoor air can be 2 to 5 times more polluted than outdoor air. Sometimes even 100 times worse in poor ventilation conditions. Allergy symptoms indoors often come from invisible culprits. Like dust mites, pollen, mold spores and pet dander. We’ve seen thousands of homeowners transform their indoor air quality just by switching to the right filter. Filterbuy air conditioner filter 13.25x13.25x1 is a smart solution that captures the allergens others miss. It’s simple, effective, and built to perform because we’ve tested it in real homes, with real results.
What sets Filterbuy apart? It’s built with premium U.S.-manufactured materials, designed to perform without inflating your energy bills or your budget.
Many of our customers say they notice cleaner air within days, especially those with pets or seasonal allergies.
“These are excellent filters and my allergies have been much better since we installed them. We were able to find a unique size too. They are also made in the US.” - Niki I.
“The filter size I was looking to purchase is uncommon. Fortunately, I found it here. It shipped quickly and was exactly as described.” - Kathleen N.
Here’s what stands out from years of customer feedback:
Cleaner air, fast – Most users notice fresher air in just a few days.
Less dust, fewer symptoms – Greatly reduces sneezing, congestion, and visible buildup.
Affordable allergy support – Offers relief without costly HVAC upgrades.

What makes Filterbuy 13.25x13.25x1 air filter for allergies stand out is its ability to actively pull in and trap these particles using natural static electricity. Unlike fiberglass filters that let allergens slip through, electrostatic filters hold onto irritants more effectively, helping to reduce sneezing, congestion, and overall discomfort.
This model uses high efficiency pleated media to catch 98% of airborne particles. Including pollen and other allergy triggers. Its electrostatically charged synthetic fibers catch microscopic particles without restricting airflow. Independent research shows electrostatic filters trap up to 94% of airborne allergens.Filterbuy offers a wide range of various sizes. We offer even odd sizes. There are numerous sizes to choose from!
Filterbuy 13.5x13.25x1 air filter for allergies offers a reliable, proven solution tailored to your system and your air quality needs.
Experience peace of mind knowing the best 13.25x13.25x1 air filter from Filterbuy significantly benefits your health and that of your family.
Allergen Reduction: High grade filters capture a huge amount of airborne irritants. This leads to a comfortable home environment.
Respiratory Health: By removing airborne particles, these filters enhance overall respiratory well being.
Prevent Mold Spores: Quality filters also reduce the spread of mold spores. Which prevents allergic reactions and respiratory problems.
Odor Reduction: An additional perk is the minimization of household odors. Resulting in fresher, cleaner-smelling air.
Fast Shipping: Customers often mention receiving their orders quickly, usually within 24 hours.
Accurate Orders: Orders are consistently correct, with no mix-ups.
Great Prices: Many customers report being pleased with the competitive pricing, making quality air filters affordable.
These positive experiences show how Filterbuy prioritizes your needs. We ensure you get the right filters for your home.
When you choose Filterbuy, you're not just buying filters. You're investing in better air quality and reliable service.
This filter size is typically used in residential HVAC systems to capture dust, allergens, pet dander, and other airborne particles. It's designed to improve indoor air quality while protecting your HVAC system from buildup.
No, it’s considered a custom or non-standard size, which is why many users turn to Filterbuy for made-to-order filters that ensure a proper fit and optimal performance.
Disposable filters: Every 60–90 days, or sooner if you have pets or allergies.
Electrostatic/washable filters: Rinse and dry monthly for best results.
Regular maintenance extends your HVAC system’s life and improves efficiency.
Yes. Electrostatic air filters attract and trap up to 94% of common allergens like pollen, mold spores, and pet dander. Many users report noticeable allergy relief within a few days of switching to this type of filter.
You can order custom-fit 13.25x13.25x1 filters from Filterbuy.com, which offers fast shipping, USA-made quality, and options for both disposable and reusable electrostatic models.
Turn off your HVAC system's power.
Have your best 13.25x13.25x1 air filter ready.
Carefully remove the old air filter.
Note the direction of the airflow arrows on the old filter.
Insert the new air filter into the slot.
If there is a cover over the filter, replace it securely.
Turn the power back on.