All filters are made in the USA  – Order Today


Premium Filters
Protects all against
Protects all against

21.5x23x1 – Merv 13

21.5x23x1 – Merv 13
AC Furnace Air Filter
Rated 0.0 out of 5
0.0 out of 5 stars (based on 0 reviews)

Select Filter Quality

Total Price
Price per filter $0
Quantity Price Per Filter
1 $0.00
2 $0.00
3 $0.00
4-5 $0.00
6-11 $0.00
12+ $0.00

Product Description

Filter Size: 21.5x23x1A

Actual Size: 21.5x23x1

Actual Size Fraction : 21-1/2x23x1

Customer Reviews

Rated 0.0 out of 5
0.0 out of 5 stars (based on 0 reviews)
5 Star0%
4 Star0%
3 Star0%
2 Star0%
1 Star0%

Review this product

Share your thoughts with other customers

Top Reviews

There are no reviews yet. Be the first one to write one.

Order 21.5x23x1 Air Filters Online

Indoor air filters can help reduce indoor allergens and improve indoor air quality by trapping particles that may otherwise enter the building. Custom Filters Direct 21.5x23x1 air filters can help prevent mold and bacteria growth in the air, which can cause health issues such as asthma or other breathing issues. Our indoor air filters also keep dust and pollen from entering your home by keeping out small particles before they reach your nose. This can help keep you from having allergy attacks on a regular basis.

Custom Filters Direct 21.5x23x1 air filters can be used in homes across all different sizes and types of environments, so they are an important tool for anyone who wants to protect their health while also improving their quality of life.

Our air filters are designed to work efficiently and last longer than cheap air filters available on the market. Over time, dust and dirt accumulate on the surface of the filters. When this happens, the HVAC system is forced to work harder than it should and could eventually cause damage. To avoid the cost and hassle of replacing the entire system, consider replacing the filters every 2-3 months.

Select the Right MERV Rating


These AC and furnace air filters capture 85% of particles 3.0-10.0 microns in size. MERV 8 filters not only prevent the growth of microbes but also remove unpleasant odors from your home environment.


MERV 11 HVAC air filters are an amazing selection if you want to remove almost allergens from your home or office environment. These filters catch more than 85% of particles ranging between 3.0 to 10.0 microns and 50% of the particles between 1.0 to 3.0 microns.


These air filters will keep the airflow clean and healthy by catching more than 90% of the airborne particles 3.0-10.0 microns in size and 75% of the particles 0.3-1.0 microns in size.

21.5x23x1 Air Filters Delivery Service

Custom Filters Direct quality 21.5x23x1 air filters are available at affordable prices with guaranteed on-time delivery. We offer an auto-delivery option to help you get a pack of new 21.5x23x1 AC and furnace air filters at regular intervals and enjoy clean, healthy indoor air without ordering the filters again and again. We also offer one-time delivery services. All our air filters come in packs of 4, 6, 12, and more. Place your order now!