Create Custom Size HVAC, Air or Furnace Filters
Step 1: Enter your filter dimensions (actual).
Step 2: Select your performance rating.
How to Measure Your Filter
Steps 1 & 2
Measuring Length and Width (L x W). (If your filter is not a square, the smallest measurement goes first).


Step 3
Measure the thickness (Depth) of your filter from front to back.

Step 4
Put Your measurements together (L x W x D).

Actual Size
A filter's true dimensions.
Example: 19.75” x 19.75” x 1”
Nominal Size
Rounded numbers used by manufacturers.
Example 20” x 20” x 1”
View Detailed InstructionsWhat’s the difference between actual and nominal size?
Actual Size
A filter’s true dimensions.
Example: 19.75” x 19.75” x 1”
Nominal Size
Rounded numbers used by manufacturers.
Example 20” x 20” x 1”
Learn MoreHow to measure your filter
View detailed instructionsAdditional info
Please Note: Due material limitations used to build a custom filter, we construct a double filter (two filters fused together) when any filter dimension is larger than 24.75” on both sides and or larger than 29.75” on one side. Please allow up to an additional five (5) business days for processing your custom filter order.
Custom filters are not eligible for return or refund.
- Nominal Depth 1” - Actual Depth 3/4”
- Nominal Depth 2” - Actual Depth 1 3/4”
- Minimum Size - 5” x 5”
- Maximum Size - 40” x 40”
Learn More About Custom Air Filters from Air Filters Direct
What Are Custom Air Filters, and How Do They Differ From Standard Filters?
What Are Custom Air Filters, and How Do They Differ From Standard Filters?
Custom air filters are created to fit unique HVAC systems and filtration capabilities for better air flow control. Air Filters Deliver can create custom filters for specific dimensions and thicknesses when a mass-produced standard air filter is inadequate. Custom AC filters provide better performance when your HVAC unit requires high-efficiency filtration, better allergen control, or has specific compatibility requirements
Why Would Someone Need a Custom Air Filter?
Why Would Someone Need a Custom Air Filter?
Consider ordering custom air filters if your HVAC system needs a specific type of filtration, non-standard size air filters, or if it needs to accommodate specific environmental conditions. A custom-made filter can be the best solution if a standard filter won’t fit properly. Whether managing industrial air quality, eliminating allergens, or ensuring energy efficiency, custom air filters can be more compatible with some HVAC systems and provide better performance than many standard choices.
What Materials Are Used in Custom Air Filters?
What Materials Are Used in Custom Air Filters?
Depending on filtration needs and compatible HVAC systems, custom air filters can be made from various types of materials. Here are common resources used when constructing them:
Synthetic Fibers: Used to create pleated filters, synthetic materials like polypropylene or polyester effectively capture particles while circulating air.
Fiberglass: Lightweight and cost-effective fiberglass filters trap larger particles but may not provide high-efficiency filtration.
Activated Carbon: These filters help remove odors and pollutants like smoke, fumes, and volatile organic compounds (VOCs).
Electrostatic Fibers: Attract and trap airborne particles, providing productive filtration.
HEPA-Grade Materials: HEPA-based materials capture 99% of contaminants including bacteria and allergens
Metal Mesh or Aluminum: These durable filters last longer because they are structurally strong.
How Do I Measure for a Custom Air Filter?
How Do I Measure for a Custom Air Filter?
To determine your custom size AC filter size, measure the length and width (L x W). The smallest measurement goes first if your filter isn’t a square. Then measure the depth of your filter from front to back to determine its thickness. Then put your measurements together (L x W x D).
How Often Should Custom Air Filters Be Replaced?
How Often Should Custom Air Filters Be Replaced?
Your custom air filters should be changed consistently every 1 to 3 months to maintain healthy indoor air conditions and proper HVAC unit performance. When a filter becomes clogged, replace it sooner. In an industrial or commercial environment, filters might need to be replaced more frequently. Pet owners might also need to change their custom air filter more often.
What Are the Benefits of Using a Custom Air Filter Over a Reusable One?
What Are the Benefits of Using a Custom Air Filter Over a Reusable One?
Custom air filters deliver better filtration than reusable filters without the burden of needing to clean them repeatedly. Reusable filters can degrade over time and lose their ability to be effective. Custom filters provide peak filtration performance until they’re replaced. They can target specific contaminants, providing better filtration of allergens, dust, and other airborne particulates.
Can Custom Air Filters Improve HVAC Efficiency?
Can Custom Air Filters Improve HVAC Efficiency?
Custom air filters frequently outperform standard size filters, providing better HVAC system efficiency by targeting certain contaminants, improving air circulation, and making HVAC equipment last longer.
Are Custom Filters Worth the Additional Cost?
Are Custom Filters Worth the Additional Cost?
The long-term benefits of better performance and reduced strain on HVAC units justify the additional cost of custom-made AC filters. Standard filters might not provide adequate air purification, which could lead to increased costs for HVAC system maintenance or repair. Business owners and homeowners who appreciate high-efficiency filtration and superior indoor air quality will value custom air filters.
How Do I Order a Custom Air Filter?
How Do I Order a Custom Air Filter?
Visit our Air Filters Delivered website to order your custom air filters. It's a simple, convenient process, and we can accommodate your needs for unique air filter sizes, specific MERV ratings, and material choices.