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Actual Size: 17.25x35.25x3.63"
3 month filters
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Made in the USA
Ships in 24 hours
Available In MERV Rating: 8, 13, 11
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.
Finding the precise 17.25x35.25x4 air filter is easy. Based on our two decades of experience in air filtration, we know that even slight size mismatches can reduce efficiency and stress your system. That’s why we specialize in delivering perfectly fitted filters, like the air conditioner 17.25x35.25x4, with high MERV-rated options that strike the right balance between clean air and airflow.
When you order from Filterbuy, you’re not just buying a filter—you’re investing in proven performance, quality you can feel, and a customer-first approach we’ve refined over years of real-world feedback.
A 17.25x35.25x4 air filter is an oversized, 4-inch-deep pleated HVAC filter measuring 17.25" wide × 35.25" long × 4" deep — a non-standard size used in larger residential and light commercial systems that need higher dust-holding capacity and longer service life than 1-inch filters.
Key things to know at a glance:
Exact size matters. A 20% size mismatch can measurably reduce HVAC efficiency, so order the precise 17.25x35.25x4 dimensions — not the nearest "close enough" size.
Pick your MERV based on your home. MERV 8 (~90% capture) for everyday dust and pollen, MERV 11 (~95%) for allergy and pet households, MERV 13 (~98%) for the highest residential-grade particle and bioaerosol filtration.
Replace every ~90 days. Quality 4-inch pleated filters last roughly 3 months — far longer than 1-inch fiberglass — and shorter intervals make sense for pets, allergies, or wildfire smoke.
This is a "hard-to-find" size at most big-box stores. Filterbuy manufactures it directly in the USA, ships it free, and offers auto-delivery so you never run short.
Skipping replacement is expensive. Clogged filters force your blower to work harder, raise energy bills, and are a leading cause of preventable HVAC repair calls.
Bottom line: If your system takes a 17.25x35.25x4, order it in that exact size, choose the MERV rating that matches your household's air-quality needs, and set a 90-day replacement cadence (or let auto-delivery handle it for you).
Correct 17.25x35.25x4 filter size boosts HVAC efficiency and lifespan.
Filterbuy delivers precision-made, American-quality filters.
Choose the right MERV rating. This keeps your air clean without airflow loss.
Change filters regularly. This avoids costly repairs.
Quality filters save money and improve home air quality long-term.
Finding the right sized air filter especially non-standard dimensions like 17.25x35.25x4 can be frustrating. That’s why we manufacture our filters in-house. This gives you access to custom fit options without the custom price tag.
Each Filterbuy filter is built with high-capacity pleated media and industrial-grade frames that resist warping, even in high-humidity environments. Our filters are available in MERV 8, 11, and 13 ratings, allowing you to target allergens, pet dander, fine dust, and even airborne bacteria, without compromising HVAC airflow.
Filterbuy 17.25x35.25x4 air filter MERV 8 captures 90% of airborne particles. It’s a great all around filter that is versatile in a lot of homes.
Filterbuy 17.25x35.25x4 air filter MERV 11 captures 95% of airborne particles. It is a good choice for homes with allergy sufferers.
Filterbuy 17.25x35.25x4 air filter MERV 13 is a premium hospital grade filter that captures 98% of airborne particles.
Our filters are custom made to exact dimensions. This ensures a secure seal that supports both filtration and airflow.
Filterbuy precision crafted options are designed to deliver cleaner and safer air. Backed by years of hands-on experience and customer feedback.
Made in the USA with strict quality standards
Fast, free shipping on every order
Direct-to-you savings with no middleman markups
Reliable performance tested across millions of installations
We know the wrong filter size quietly hurts your HVAC. Here’s what our experience and research show:
Precision Sizing Prevents System Stress
Poorly fitting filters cause airflow issues.
HVAC units work harder and wear out faster.
NIST research shows that even a 20% mismatch lowers performance across climates.
Indoor Air Pollution
Indoor air is 2 to 5 times higher than outside.
Proper filters improve air quality and health.
HVAC Repairs Are Costly but Preventable
Many repairs result from clogged or wrong-sized filters.
The US spends $14 billion yearly on HVAC repairs and replacements.
Filter maintenance helps avoid these costs.
A clogged filter restricts the flow of air to your HVAC. Your HVAC has to work harder to push through all the dirt and debris. This extra work leads to more energy bills which everyone doesn’t like.
Regularly replace your air filters. Clean and high quality filters extend your HVAC’s life.
Regular filter replacement makes sure the airflow is smooth. This also prevents your HVAC from wearing out early.
Clean filters stop harmful dust and debris from accumulating. This protects them from damage.
Clean filters ensure proper airflow. They prevent the HVAC's parts from overheating.
Free, Super Fast Shipping — Sometimes next-day.
Buy packs, get up to 70% off each filter.
These filters actually last for 90 days — way longer than cheap fiberglass versions.
Made right here in the USA with super high quality materials.
Auto Delivery option —save another 5% and you'll never forget to replace your filters again.
Super Easy, Super Affordable.
The numbers represent the filter’s dimensions in inches: 17.25 inches wide, 35.25 inches long, and 4 inches deep. This exact size ensures a proper fit in your HVAC or furnace system, which is essential for optimal airflow and filtration performance.
MERV ratings indicate a filter’s ability to capture particles. MERV 8 is suitable for basic dust and pollen. While MERV 11 or 13 filters are better for allergies, pet dander and finer particles. Choose based on your household’s air quality needs and HVAC specifications.
Filters should be replaced every 3 months. However, if you have pets, allergies or high pollution areas, replacing them more frequently can maintain better air quality and HVAC efficiency.
Using the exact size is important. Filters that are too small or too large can cause air leaks, reduce filtration efficiency and strain your HVAC. We recommend ordering precisely sized filters to avoid these issues.
Filterbuy specializes in custom and hard-to-find size filters. Filterbuy filters like 17.25x35.25x4 air filters for allergies are American made with strict quality control, shipped fast and priced competitively by cutting out middlemen. We offer expert customer support based on decades of industry experience.
Choose the correct size
Turn off the power supply
Remove the old air filter
Dispose the old product
Insert the best 17.25 x 19.25 x 4 air filter from Filterbuy
Replace the cover
Buy 17.25x35.25x4 air filter in bulk
Buy directly from trusted online suppliers. Filterbuy.com is a great source. This saves you time. You do not have to search many stores.
Filterbuy.com is your most reliable source. They specialize in a wide variety of air filter sizes, including the best 17.25x35.25x4 air filter and offer direct shipping.
Using a cheap 17.25x35.25x4 fiberglass air filter air filter might save you a little money upfront. But cheap filters don’t last long or clean the air well. A high-quality 17.25x35.25x4 electrostatic air filter with the right MERV rating protects your unit and your health.
Yes. A 17.25x19.25 carbon air filter is the same as a 17.25x19.25 charcoal air filter. They’re the best at improving your home’s air quality and keeping unpleasant odors away.
Skip the big-box hunt and get the exact 17.25x35.25x4 size — MERV 8, 11, or 13 — shipped free from our USA factory straight to your door. Shop Filterbuy now or set up auto-delivery and never think about your filter change again.
