500k+ Businesses & Facilities

Air Filters & Furnace Filters

Shop Our Custom Air Filters to Improve Your Indoor Air Quality. Enjoy Free and Fast Delivery!

Verified Ratings
Free Shipping orders over $25.00 Money Back Guarantee

Verified Reviews

Verified Reviews

Verified Reviews

Verified Reviews

Verified Reviews

SHOP FILTERS BY SIZE

Residential, Commercial And Industrial HVAC Air Filters

Commercial/Industrial HVAC Air Filters

Commercial/Industrial HVAC Air Filters

Air filters are essential for improving the air quality in homes, offices, and other spaces. They help trap dust, pollen, smoke, and other harmful particles in the air. Indoor air can have more pollution than outdoor air, which is why using good filters is so important. At Custom Filters Direct, we understand how important it is to maintain clean air, especially in large commercial and industrial spaces. Our HVAC filters are built for bigger environments like factories, warehouses, and office buildings, ensuring the air stays clean and equipment runs smoothly. These filters are energy-efficient, helping your HVAC system work better and save energy. We offer filters in various sizes and MERV ratings, making it easy to find the right one for your space. Our filters last longer, saving you time and money on replacements, while also improving airflow and air quality.

Shop Now Learn More
Residential HVAC Air Filters

Residential HVAC Air Filters

Air filters for your home are essential for maintaining clean and healthy air. They trap dust, pollen, pet hair, and other particles that can make the air dirty, helping to improve air quality and reduce breathing problems like allergies and asthma. At Custom Filters Direct, we're here to help you breathe cleaner air with our reliable residential HVAC air filters. Whether you’re dealing with pet hair, pollen, or dust, our filters are designed to trap those particles and enhance the air you and your family breathe. We offer a variety of MERV-rated filters to suit your needs, ensuring your HVAC system runs more efficiently and lasts longer. Changing your air filter regularly not only helps reduce allergens but also keeps your home more comfortable. Filters also prevent dirt and debris from building up in your HVAC system, helping it function better and increasing its lifespan. With simple online ordering and fast delivery, we make it easy for you to keep your home’s air clean and your HVAC system working smoothly.

Shop Now Learn More
Custom Size Air Filters

Custom Size Air Filters

Our custom filters are made to fit your HVAC system perfectly. Unlike regular filters, these are designed specifically for your needs, whether you have a unique vent, an older unit, or special requirements.

We offer over 1,000 air filter sizes in stock to ensure the perfect fit for your system. If you're unsure of what you need, check our resources to find the right match or contact our team for assistance.

We focus on providing high-quality filters at an affordable price. While custom filters might take a little longer to make, we also have a wide range of standard filters ready to ship. Let Custom Filters Direct help you improve air quality with filters made to your exact specifications, ensuring a healthier and more comfortable indoor environment.

Shop Now Learn More

Industries We Serve

We offer high-quality air duct filters designed to meet the specific needs of different industries. Our focus on innovation, efficiency, and superior air quality makes us a trusted choice for businesses in various sectors. Here are some of the industries we proudly serve:

HVAC and Building Maintenance

HVAC and Building Maintenance

Manufacturing and Industrial Facilities

Manufacturing and Industrial Facilities

Healthcare and Pharmaceutical

Healthcare and Pharmaceutical

Food Processing and Packaging

Food Processing and Packaging

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.

Jenny Wilson

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

Emma Charlotte

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! 

Amos Mateo

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

Isabella Luna

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

Oliver Wilson

They arrived quickly and I noticed the difference in air quality the night I put them in! Perfect filters – especially for anyone with allergies!

Sophia Amelia
  • (46) Verified Reviews

  • (46) Verified Reviews

  • (46) Verified Reviews

  • (46) Verified Reviews

  • (46) Verified Reviews

(46)Verified Reviews

(46)Verified Reviews

(46)Verified Reviews

(46)Verified Reviews

(46)Verified Reviews

Why Choose US?

Air Filter cart icon

Buy In Bulk, Save Big

Learn More
custom sizes

Custom Sizes

Learn More
Shop on your terms

Shop Conveniently

Learn More
delivered

Doorstep Delivery

Learn More

Nationwide Custom Air Filter Deliveries

Quick turnaround in all 50 states! Hover over a state to explore further details on your local coverage.

The right air filters can keep your family safe from harmful airborne allergens and irritants, such as:

Shop By MERV Quality

Standard

MERV 8

merv 8 air filter Select MERV 8

MERV 11

merv 11 air filter Select MERV 11

MERV 13

merv 13 air filter Select MERV 13

Frequently Asked Questions

  • Step 1 - To determine the correct size for your filter, start by removing it from its vent. 
  • Step 2 - Check the side of the filter to see if the size is printed, such as 20x20x1. If the size isn’t printed, use a ruler or tape measure to measure its dimensions. 
  • Step 3 - Measure the length (the longest side), width (the shorter side), and thickness (how thick the filter is). Round each measurement to the nearest inch.

Following these steps will help you find the right size to replace your filter or order a custom one.

The three main types of air filters are:

  • Fiberglass Filters: These are basic, budget-friendly filters that trap larger particles like dust and lint. They provide minimal filtration and are suitable for general use in low-demand environments.
  • Pleated Filters: Made of polyester or cotton paper, these filters have a pleated design that increases their surface area, allowing for better filtration. They are more effective at capturing smaller particles such as dust, pollen, and mold spores.
  • HEPA Filters: High-Efficiency Particulate Air (HEPA) filters are highly efficient, capturing up to 99.97% of airborne particles as small as 0.3 microns. They are ideal for improving air quality in environments where allergens, dust, and other small pollutants are a concern.

Each type of filter offers different levels of efficiency, so it's important to select the one that best meets your air quality needs.

Yes, some air filters are reusable, while others are not. Washable or reusable filters can be cleaned and used again after they become dirty. These are typically made from materials like aluminium or fibreglass. However, disposable filters are designed to be replaced once they are clogged and cannot be reused. Always check the manufacturer's guidelines to determine if your filter is reusable or needs to be replaced.

Air filters don’t actually detect air quality on their own. However, some air systems have sensors that can detect things like dust, smoke, or harmful gases in the air. When these sensors notice poor air quality, they can adjust the system to clean the air more effectively.

Air filters help improve air quality by trapping things like dust, pollen, and allergens. Filters like HEPA or carbon filters are made to catch these particles, making the air cleaner and healthier to breathe.

Custom air filters are a better choice than standard filters for a few reasons:

  • Perfect Fit: They are made to fit your specific system, which helps it work better.
  • Better Filtration: You can choose the type of filter you need, whether it’s for dust, allergens, or other particles.
  • More Efficient: Custom filters can match your system’s airflow, making sure it works smoothly and doesn't clog up.
  • Last Longer: Since they are made for your system, custom filters can last longer and save you money on replacements.
  • Made for Your Needs: Custom filters can be designed for special environments, like areas with a lot of pollution or clean rooms.

Overall, custom air filters give you better protection and performance, making them a smart choice for your needs.

It is generally not recommended to cut air filters to size. Cutting a filter can damage it, reduce its effectiveness, and affect its ability to properly filter the air. Most air filters are designed to fit specific sizes, and altering them could lead to gaps where air can bypass the filter, allowing dust and allergens to escape.

If your filter doesn't fit, it's best to buy one that is the correct size or use a custom filter designed to meet your needs. Always follow the manufacturer's guidelines for the best performance.

Changing your air filter is a simple process. Here's a step-by-step guide:

  • Turn off the system: Before you begin, turn off the heating or cooling system to prevent any air from blowing while you change the filter.
  • Locate the air filter: Find the filter in your system. It is usually located in the return air duct, air handler, or HVAC unit. It may be behind a panel or grill.
  • Remove the old filter: Carefully slide out the old filter. Take note of how it’s positioned (the direction of the airflow is usually indicated on the filter frame).
  • Check the size: Before installing a new filter, make sure the replacement filter is the same size as the old one. This is important for proper fit and performance.
  • Insert the new filter: Slide the new filter into place, ensuring it is positioned in the same direction as the old one (airflow arrows usually point toward the unit).
  • Turn the system back on: Once the new filter is in place, close the panel and turn your system back on.

Check your filter regularly and replace it as needed, usually every 1-3 months, depending on the type of filter and your usage.

You should replace your air filter every 1 to 3 months for most standard filters. If you have pets, allergies, or live in a dusty area, you might need to replace it more often.

For high-efficiency filters like HEPA, you can usually replace them every 6 to 12 months.

It's a good idea to check your filter every month. If it looks dirty or clogged, replace it, even if it's not quite time yet. Replacing the filter regularly helps keep the air clean and your system working well.

MERV, MPR, and FPR are ratings that show how well an air filter traps particles:

  • MERV (Minimum Efficiency Reporting Value): Rates filters from 1 to 20. Higher numbers mean the filter traps smaller particles, like dust and allergens.
  • MPR (Micro-Particle Performance Rating): This is used for 3M filters and measures how well they capture tiny particles. Higher numbers mean better filtration.
  • FPR (Filter Performance Rating): This rating is used for filters sold at Home Depot, ranging from 4 to 10. Higher numbers indicate better filtration.

The main difference is the scale they use, but all help you understand how good a filter is at cleaning the air. The higher the number, the better the filter.

Using the wrong size air filter can cause problems like:

  • Poor Air Quality: If the filter is too small, air can bypass it, letting dust and allergens get into your system.
  • Reduced Efficiency: A filter that’s too big may not fit properly, blocking airflow and making the system less effective.
  • Damage to the System: A bad fit can strain your system, making it work harder and potentially causing damage.

Always use the correct size filter for the best performance and air quality.

If you have any questions or concerns about our service or products, reach out to us using this contact information:

Contact No: (877) 556-2862

Email ID:  info@customfiltersdirect.com

Read Our Latest Blog

View All Articles
Akshay Sadiora

Washable Vs Disposable Air Filters: Understanding The Difference

When it comes to maintaining a clean and healthy indoor environment, the right air filter for your HVAC system plays an important role. Air filters trap airborne pollutants like dust,...

Akshay Sadiora

Different Types Of Air Filters: Pros And Cons

It is essential for every person to have clean fresh breathable air in their home and office. This not only keeps them comfortable but also promotes a healthy environment for...

Akshay Sadiora

The Cost Of Neglecting HVAC Filters In Commercial Buildings

Just imagine that your HVAC system is working but instead of you having benefit from it. You are getting high energy bills and poor indoor air quality and the reason...

Akshay Sadiora

Why MERV Ratings Matter In Commercial HVAC Systems

Commercial spaces are considered one of the most busy places. Commercial buildings are the areas that are used to do business like selling, marketing, and handling various operations to excel...

Akshay Sadiora

The Future Of HVAC: Emerging Trends And Technologies To Watch

Do you know that HVAC systems are responsible for consuming about half of the total energy in the world? Lots of HVAC industries are working to reduce the overall consumption...

Akshay Sadiora

DIY vs. Professional HVAC Maintenance: What You Can Do and When to Call the Pros

HVAC systems are an important part of the home because they continue to work efficiently so that you can be comfortable in your home. However, many people often make the...