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Choosing the Right MERV for your AC and Furnace Air Filter
20x20x1 Air Filters For AC and Furnace
The 20x20x1 air filter is the most popular size for home HVAC systems. Built to fit standard HVAC units, including furnaces, air conditioners, and heat pumps, our 20x20x1 filters are available at MERV 8, 11, and 13, providing a full range of filtration capabilities. Besides, our top-quality filters are manufactured in the USA, using top-notch materials, which helps improve the system's performance, increase its longevity, and protect your family from airborne pollutants.
Whether you’re tackling allergy season, managing pet dander, or just want fresher air indoors, our 20x20x1 air filter delivers powerful protection and consistent airflow.
Why Choose Custom Filter Direct 20x20x1 Air Filter?
- Powerful Filtration: Traps dust, pollen, pet hair, mold spores, and more.
- Available in MERV 8, 11, and 13: Choose the right filtration strength for your home’s needs and equipment capacity.
- Made in the USA: We are a solid, family-owned American business, taking care of fellow American families for over 20 years. Additionally, we offer top-quality air filters at affordable prices with fast, free shipping.
- Improves HVAC Efficiency: Helps your system run more smoothly and use less energy.
- Versatile Compatibility: Works with most residential HVAC systems.
- Tool-Free Installation: Quick and easy filter swaps in under a minute.
20x20x1 Air Filter Specs (nominal and actual size)
- Size: nominal size: 20 x 20 x 1 inches; actual size: 19.5 x 19.5 x 0.75”
- MERV Ratings: Available in MERV 8 (basic), MERV 11 (enhanced), and MERV 13 (high-efficiency)
- Recommended Replacement: Every 60–90 days (or more often with pets or allergies)
- Frame: Moisture-resistant, reinforced construction
- Media: Electrostatic, pleated filter media for superior particle capture
Other popular sizes:
20x20x1 is not the right size for you? A perfect fit is essential for optimal filtration, so here are other popular sizes.
Ideal For:
- Pet owners trying to reduce airborne pet dander and hair
- Households with allergy or asthma sufferers
- Urban areas with high dust and smog levels
- Preventative HVAC maintenance and energy saving.
Maintenance Tips for Peak Performance
- Replace on Time: Set a reminder every 2–3 months (monthly if you have pets or allergies)
- Check Fit: Ensure a snug, sealed fit inside your HVAC unit
- Don’t Reuse: Even if it looks clean, a used filter loses efficiency
- Monitor Airflow: If airflow drops, check your filter — it may be clogged
FAQs About 20x20x1 Air Filters
What does 20x20x1 mean in air filters?
It refers to the filter’s nominal, commercial dimensions in inches — length x width x depth. It's the dimensions you find on most labels and stores. For a 20x20x1 size, the actual filter size is 19.5 x 19.5 x 0.75”. If your air filter doesn't have a label, measure it to find the right size before buying.
Can I use a higher MERV rating than my current filter?
Yes, but check your HVAC manual. Higher MERV filters trap more particles but may restrict airflow in some older systems.
How do I know when to change my 20x20x1 filter?
Typically, you should check your air filter every 2 to 3 months to determine if it needs to be changed. That's because the right time to change any air filter is when it is not capturing pollutants as it should. It depends on household inhabitants' sensitivity, pollution, etc. So, in conclusion, if you notice more dust around your home, increased allergies, or higher energy bills, it’s time to check and replace the filter.
Is this filter washable or reusable?
No — the 20x20x1 air filter is disposable. Replacing it on schedule ensures top performance and cleaner indoor air.
Customer Reviews
Overall rating: 4.6 / 5 from 1114 reviews.
Send us the correct size filters ASAP
Quick delivery, fats and efficient
I’m really not sure what the problem is? This is the second order in a row that’s been completely damaged. I think this order there may be one usable filter out of six. I really am not interested in a refund. I would just like to get a good undamaged order of filters. This is the second time in a row. I understand it’s not your fault but maybe you could have a discussion with the shipping agent, thanks Wallace Anderson
My filters came damaged!
You sent me the wrong filters and have not responded to my customer support ticket
Shipping has to be quicker
Delivery took little longer than expected, though worth the wait. They fit perfect in our little basket for it as you can see by the video.
I bought total 6 filters, 20x25x1. and install it for ceiling filter for my house's air-conditioning. At first, it bend after 3 days (shown in picture), I thought I install it wrong and call a air-condition technician to install for me. After few days later, the same thing happens again. so far, all 5 of 6 is gone bad in matter of 2 weeks. Last year, the same size filters from Home Depot never experience such situation. The problem with this filter is either the side support paper is too weak or the wire on the back can not sustain the paper form to keep it straight. It need to be improved for sure.
Great product works great let’s lots of air flow pass happy/happy/happy. Thanks so much Tony r smith
Ordered some 10x10x2 filters for a fresh air intake that are not readily available locally. Received filters within 5 days, works great.
Thank you!
We are so happy with our new filters! package came fast and impecable.
Very easy to order and receive the HVAC filters from Custom Filter Direct.
No complaints with the filters. Easy to order and showed up in good shape. Took a while to get here but that was ups's fault.
These filters were a fraction of the cost of other filters. They seem to be high quality and they shipped them to me exceptionally fast! I am very impressed!
GREAT price on filters. Buy more and save! If I bought from my HVAC tech, I'd literally would pay for just one, that I paid for 6 from this awesome company!
I got like 6 filters so I don't have to worry for 3 months! My little heater thing takes 2 air filters, so the bulk option was a life saver. Thanks guys!
Quick shipping easy order process
I am an HVAC contractor and frequently run into odd floor filter sizes. This particular one was a 12x22x1 slot. Absolutely none of my local supply houses had this size, nor were able to get the filters for a reasonable price. With CFD, Both price and shipping were relatively cheap. I am very pleased with Custom Filters and have them on my go-to list now.
The delivery was timely, the price was right and everything fits perfectly. I’ll definitely order again!
I updated a 16 by 25 by 1 filter frame to a 16 by 30 by 4 frame I designed myself by cutting off lip of 1 inch frame and building an aluminum frame 4 inches behind it and sealing it. It's an odd ball size but custom filter had this size and they are excellent filters. Will buy from them again. Heavy duty, air flow is perfect, couldn't ask for more.
The filters seem good quality for a great price and quick shipping.
Came Quick. Fit perfect. Fair price...Go for it......
Filters arrived smashed with corners separated . As requested,I sent pictures of damaged filters. Thus far no replacement or refund received.
Great price great product couldn't be happier with purchase or company.
Great price. Great quality
Hard to find my AC filters ,but you all make it so easy to order and packaged nicely .thankyou!
These furnace filters are excellent quality at a great low price with free super fast delivery.
All was good. Perfect fit, every filter is individually wrapped, and everything arrived within a week after ordering. Very happy with my order.
Great filters fit perfect
Because the frame is little bit small, it makes some noise when my hvac starts and ends. But everything else is great.
Great product for a great price! Will be ordering again when the time arrives
packaging still needs work. Bigger filters show up mangled every time.
Will I put it in. And it cleans the air.
These came in a timely manner and were packaged well. So far so good!
Great job Thank you
Fits like a glove, perfect for my system.
quality product, easy order, fast delivery, and inexpensive.
Package received this way , bent crushed, and no labeling to identify the merv level filter received. Just a clear Package and nothing else.