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Furnace & Air Filter Sizes | Find Your Perfect Fit
Welcome to Custom Filters Direct, your trusted source for furnace filter sizes and air filter sizes. Whether you need standard or custom filters for your HVAC system, we’ve got the perfect solution to meet your needs. Enhance your indoor air quality and keep your heating and cooling systems running efficiently with our wide range of options.
Standard and Custom Air Filters
We offer both standard and custom furnace and air filter sizes to accommodate any HVAC system:
- Standard Filters: Available in all common air filter sizes, these are ready to ship for immediate use.
- Custom Filters: Can’t find your size? No problem! We specialize in crafting custom air filters and furnace filters tailored to your exact requirements.
Why Choose Custom Filters Direct?
- Extensive Inventory: We carry all standard air filter sizes and offer custom options for unique needs.
- High-Quality Materials: Our filters are durable and designed to trap dust, allergens, and other airborne pollutants effectively.
- Fast Shipping: Get your air filters or furnace filters delivered quickly and conveniently.
- Enhanced Air Quality: Protect your family, employees, or customers with premium air filtration solutions.
Popular Air Filter & Furnace Filter Sizes
Here are some of the most commonly purchased sizes:
- 16x20x1
- 20x25x2
- 14x30x1
- 12x24x1
- Don’t see your size? Request a custom filter today!
How to Measure Your Air or Furnace Filter
- Remove your old filter from the HVAC system.
- Measure its length, width, and Depth (typically in inches).
- Check for dimensions printed on the filter itself—most standard air filter sizes and furnace filter sizes are labeled.
Order Your Furnace & Air Filters Today!
Stop worrying about finding the right air filter size or furnace filter size. Custom Filters Direct makes it easy to shop from an extensive collection of filters for homes and businesses. Use our size selector, explore our size chart, or order a custom filter for an exact match.
Need more help? Contact our team for personalized assistance with furnace and air filter sizes. We’re here to help!
Proof Of Happy And Satisfied Customers
There’s no better proof of the quality of our air filters and service from our satisfied customers:
I use this website every time I need to order filters for my house. Service is great, & the product is great. We had a very hard time finding our odd sized filter in stores or online.
I own and operate a residential rental property business. Changing air filters has been a huge challenge for us in the past. Custom Filters Direct made the entire process for us a breeze
I never knew the importance of an air filter subscription until I actually had my filters delivered on a quarterly basis. Every time I forgot about the filters they show up in the mail!
We needed a custom size for our new rooftop units, contacted Custom Filters Direct and they got me exactly what I needed, delivered to my property managers office a few days later. Highly recommended
I emailed them a list of my furnace filter sizes. The quote I got was spot on, and it arrived on time. I am going to reorder from them
They arrived quickly and I noticed the difference in air quality the night I put them in! Perfect filters – especially for anyone with allergies!
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(46) Verified Reviews
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(46) Verified Reviews
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(46) Verified Reviews
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(46) Verified Reviews
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(46) Verified Reviews
(46)Verified Reviews
(46)Verified Reviews
(46)Verified Reviews
(46)Verified Reviews
(46)Verified Reviews
Frequently Asked Questions
Check the dimensions printed on the side of your current filter. If it’s not visible, measure the filter’s length, width, and thickness. These are the dimensions needed to order the correct size.
Nominal sizes are the rounded measurements used for marketing (e.g., 16x20x1). Actual sizes are the precise dimensions of the filter (e.g., 15.5x19.5x0.75). Always verify the actual size before purchasing.You can read more about Nominal vs. Actual Air Filter Size.
It’s not recommended. Using a filter that doesn’t fit properly can reduce efficiency and allow dust or pollutants to bypass filtration. Always choose the exact size or order a custom filter.
Popular sizes include:
- 16x20x1
- 20x25x2
- 14x30x1
- 12x24x1
If you don’t see your size, we can create a custom filter for you.
For standard filters, replace them every 1-3 months. For high-efficiency or custom filters, follow the manufacturer’s recommendations, which may vary based on usage and air quality.
Yes, thicker filters (e.g., 2-inch or 4-inch) can last longer than standard 1-inch filters, as they have more surface area to capture particles. However, confirm compatibility with your HVAC system before upgrading to a thicker filter.
Our filters are made from high-quality pleated media, designed to trap dust, pollen, mold spores, pet dander, and other airborne pollutants effectively.
Absolutely! If you need a specific size not available in our standard range, we can create a custom air filter tailored to your needs.
The MERV (Minimum Efficiency Reporting Value) rating indicates a filter's ability to trap particles. Higher MERV ratings (e.g., 11 or 13) capture smaller particles but may restrict airflow in some HVAC systems. Choose the right balance for your system.
Yes, we provide both residential and commercial air filter solutions, including standard and custom sizes, to maintain excellent air quality in larger spaces.