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20x25x1 Air Filter Merv 8
20x25x1 AC Filter Merv 11
20x25x1 Furnace Filter Merv 13
20x25x1 Filter Merv 13 Titanium
20x25x1 Filter Merv 10 Carbon
20x25x1 Filter Merv 8 Carbon 20x25x1 Filter Merv 8 Carbon
Protects All Against
  • Pollen protection
  • Dust protection
  • Mold protection
  • Dust Mites protection
    Dust Mites
  • Bacteria protection
  • Pet Dander protection
    Pet Dander
  • Smoke protection
  • Viruses protection
  • Cooking Smoke protection
  • Odor protection
  • Smog protection
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20x25x1 Air Filter

AC Furnace Air Filter 20x25x1 -Inches

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Odor Eliminator

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Product Description

Item Model Number: FKFB20X25
Brand: Filter King
Filter size: 20x25x1
Actual Size: 19.5 x 24.5 x .75
1-Inch Filter
MERV 8 Filter Rating
Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses
Residential / Commercial Use

Manufactured in the US

Why Buy Air Filters From Filter King?


In comparison to fiberglass filters, 20x25x1 pleated air filters are at least 20 times more effective. All Filter King air filters are made in the US.


Filters frames are made out of heat resistant paperboard with horizontal grid supports. Able to withstand temperatures of up to 200° F and resistant to moisture, the paperboard frames do not support microbial growth and outperforms traditional cardboard frames.


Chemical free, electrostatically charged synthetic polyester media is pleated, maximizing the surface area, to capture a high number of airborne particles as small as 0.3 microns with low air flow resistance. To increase durability, the media is supported with a corrosion resistant steel wire.

20x25x1 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 20x25x1 Air Filter?

Filter King AC & furnace filters aren’t the typical fiberglass filters that need to be replaced every 30 days. Our filters can typically be used for 3 to 5 months before requiring to be changed. Naturally, a variety of things influence filter lifespan.

Some of the factors that influence your filter’s life include outdoor air quality, whether pets are in the home, and how well your HVAC system is maintained.

Your air filter becomes clogged over time by trapped particles, preventing airflow. The efficiency of the HVAC filter declines. Your system must work harder to heat and cool your home. The extra strain on the HVAC system causes higher energy bills. Regular home air filter replacements can prevent expensive system repairs or replacements down the road.

You should change your filter more frequently if you notice:

  • Household dust build-up
  • The air isn’t cooling as is used to
  • There’s more dust near the air vents
  • A dirty filter surface
  • Higher energy bills
  • Burning smells near your HVAC system.

20x25x1 Air Filters

Furnace Filters 20x25x1

The Filter King 20x25x1 air filter is among the most common since they are a regular size filter used in an air system. They prevent harmful airborne particles from entering your home or office. It fits into your HVAC system to treat incoming air before it makes its way into your living space.

The Filter King 20x25x1 filter ensures that the air you breathe is clean and free of allergens or contaminants. We offer three MERV ratings to choose from. This makes it easy for you to choose the right protection level for you and your loved ones.

100% Made in the USA

All Filter King filters are made in the USA to ensure you always receive a high-quality product. Our warehouse in Alabama lets us offer fast shipping and easy returns to customers throughout the lower 48.

Fast Shipping Guaranteed

Filter King offers quick shipping so you can improve your home’s air quality as soon as possible. When you order two or more filters, you can get free shipping on your order inside the contiguous United States. International orders and orders from Hawaii and Alaska require a custom freight quote.

For orders within the U.S., most filter sizes ship within two business days. You’ll receive your FedEx Home Delivery within five business days of shipment. You can return most sizes within 30 days of purchase. Custom filters cannot be returned.

MERV Rating: Which Should You Use?

The Minimum Efficiency Reporting Value, or MERV, is how filters are categorized. Developed by the American Society of Heating, Refrigeration, and Air Conditioning (ASHRAE), it is the only nationally regulated independent filtration system. The MERV rating is a consumer standard that ensures all filters with the same rating filter the same way.

The higher the MERV rating, the more contaminants the filter can block. Lower ratings filter dust and dirt. Filter King offers 20x25x1 air filters in MERV 8, 11, and 13. We also offer a carbon filter to eliminate odors.

4-6 Rating: Recommended For Industrial Workplaces

Removes pollen, dust mites, carpet and clothing fibers, cockroach waste, cement dust, hair spray, etc.

Here at Filter King, we don’t recommend using MERV ratings 4-6 for home use. However, they are the right choice for environments that need little filtration, such as industrial workplaces. You can find these filters in both washable and disposable forms. They are the cheapest options on the market.

8-13 Rating: Recommended For Home Use

Removes pet dander, lead dust, Legionella bacteria, milled flour, welding fumes, dust from humidifiers and nebulizers, coal exhaust, smog

The air filters best for homes use fall within the MERV 8-13 rating. In addition to residential use, they are sufficient for commercial use. Depending on your home environment, you may want to consider different ratings.

Good: MERV 8 Filter

At a minimum, MERV 8 filters are appropriate for the majority of homes. MERV 8 filters are best for those living without pets, asthma, or allergies.

Better: MERV 11 Filter

One step higher than the MERV 8, the MERV 11 is a mid-level filter. It can remove more contaminants, such as allergens and pet dander. It is the best choice for people with pets or those living with allergies or asthma.

Best: MERV 13 Filter

For those living with severe breathing issues, such as COPD, asthma, lung disease, chronic bronchitis, or a compromised immune system, a MERV 13 filter offers the highest filtration levels.

14 - 20 Rating: Recommended For Hospital & Laboratories

Removes bacteria and viruses, sneeze and cough droplets, auto emissions and fumes, tobacco smoke, insecticide dust, face powder, microns, radon, carbon dust, salt, lint, etc.

Filters in the MERV 14-20 range are best for environments that need to be incredibly clean, such as hospitals, manufacturers, laboratories, etc. These filters are necessary for home environments, and it’s unlikely you’ll find one that’s small or affordable enough to use in your home. We do not recommend them for residential use as they can increase your energy bills dramatically.

FAQs: Common Questions

Below are a few commonly asked questions about our 20x25x1 air filter.

When Should I Change an Air Filter?

Most residential filters last three to five months before you need to replace them. When you start to notice your indoor air quality decline, it’s time for a replacement. To stay safe, you can take advantage of our filter delivery subscription service so that you receive clean replacement filters on a schedule to ensure clean air year-round.

What MERV Rating Filter Should I Pick?

The best option we offer is the Titanium MERV 13 20x25x1 air filter, but this is often overkill for the typical home. It’s only necessary when someone in your family deals with severe breathing issues and other health conditions. Healthy individuals without pets will be fine with a MERV 8, while people with pets or mild health issues affecting breathing should go with a MERV 11.

Do You Have Warranty on Your Filters?

We accept returns on our standard filters within 30 days of purchase. Custom-ordered filters are not eligible for return.

Do You Offer Discounts on Bulk Purchase?

Filter King offers discounts on bulk purchases for all of our 20x25x1 air filters. You can buy 1-6 or 12 filters at once with a significant discount. Ordering more than two filters qualifies you for free shipping as well if you are in the contiguous United States.

How Long Does the Shipment Take?

For orders of our standard-sized filters, your order will leave our Alabama warehouse within two business days. Custom filter orders ship within five business days. You’ll receive tracking information immediately after shipment. Typically, you will receive your order within five business days of shipment. International orders will take longer and vary based on customs and other factors.

Filter King: Air Filter Delivery Service

It’s easy to forget to replace your filters. That’s why we offer a hassle-free 20x25x1 air filter subscription, so you never forget again. Simply choose your correct filter size, your preferred delivery frequency, and we’ll handle the rest.