All filters are made in the USA  – Order Today


Premium Filters
Protects all against
Protects all against

18x20x1 – Merv 11

18x20x1 – Merv 11
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: 18x20x1

Actual Size: 17.75×19.75×1

Actual Size Fraction : 17-3/4×19-3/4×1

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.

Buy 18x20x1 Air Filters Online

If you don’t have quality air filters installed in your home or workplace, your place is subject to get exposed to pollutants. You need quality air filters to trap harmful allergens to enter your space with the airflow from outside.

Custom Filters Direct 18x20x1 air filters provide your home or office with the much-needed layer of protection against airborne pollutants and allergens. Our air filters are constructed using a top-quality synthetic material that not just cleans the indoor air, but also prevents contaminants from building up on the ducts.

Manufactured in the USA, these air filters maintain excellent clean airflow, provide exceptional working performance, and have a maximum dust holding capacity. All these features make our air filters almost 20 times more efficient in trapping harmful contaminants than ordinary filters.

Custom Filters Direct 18x20x1 air filters provide a healthy environment and are an economical choice for most businesses, institutions, and homes. With our superior quality air filters, you
can block a large number of irritating and harmful airborne particulates. For the best performance, we recommend you to change your air filters every 2-3 months, especially if you have pets or live in a high-pollen area.

Select the Right MERV Air Filter


Ideal for most common residential settings, our MERV 8 filters trap 85% of the airborne particles 3 to 10 microns in size. These filters trap pollen, lint, dust mites, mold, and more.


Ideal for both residential and commercial environments, MERV 11 filters trap more than 85% of the airborne particles 3 to 10 microns in size and 50% of the particle 1 to 3 microns in size.


MERV 13 AC and furnace air filters are more efficient at trapping particles than MERV 11 and MERV 8 filters and are ideal to use at hospitals, healthcare facilities, industrial applications, and more. These filters trap more than 90% of the airborne particles 3 to 10 microns in size and 75% of the particle 0.3 to 1 micron in size

Affordable 18x20x1 Air Filters Delivery

At Custom Filters Direct, we make shopping for 18x20x1 AC and furnace filters easy and affordable. We offer an air filters subscription service, also called the auto-delivery service of air filters. You can subscribe and get a pack of air filters at a regular interval without placing your order again every time. We also offer a one-time delivery option. All our air filters are delivered in packs of 4, 5, 12, 48, and more. For those who need to buy 18x20x1 air filters in bulk, we have a special discount for you. So, place your order now!