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16x25x4 Air Filter Merv 8 16x25x4 Air Filter Merv 8
16x25x4 AC Filter Merv 11 16x25x4 AC Filter Merv 11
16x25x4 Furnace Filter Merv 13 16x25x4 Furnace Filter Merv 13
16x25x4 Filter Merv 13 Titanium 16x25x4 Filter Merv 13 Titanium
16x25x4 Filter Merv 10 Carbon 16x25x4 Filter Merv 10 Carbon
16x25x4 Filter Merv 8 Carbon 16x25x4 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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AC Furnace Air Filter 16x25x4 -Inches

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Product Description

Item Model Number: FKFB16X25X4
Brand: Filter King
Filter size: 16x25x4
Actual Size: 15.5 x 24.5 x 3.75
4-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, 16x25x4 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.

16x25x4 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 16x25x4 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.

16x25x4 Air Filters

AC Furnace Air Filter 16x25x4-Inches

Filter King 16X25X4 air filters are designed to protect your home from airborne particles from getting trapped inside. It fits directly into your furnace to treat incoming airflow before it reaches your living space.

The Filter King 16X25X4 furnace filter helps keep the air that you breathe clean, safe, and free of contaminants or allergens that might cause harm. It comes in a choice of three different MERV ratings, giving you as much protection as you and your family needs.

100% Made in the USA

All Filter King products are made in the USA to guarantee quality. Buying a Filter King air filter means supporting U.S. workers and businesses with your purchase.We operate out of a warehouse in Alabama and offers easy shipping and returns to customers within the contiguous United States.

Fast Shipping Guaranteed

Filter King promises fast, reliable shipping so that you can start improving your home air quality as soon as possible. U.S. customers can get free shipping when ordering two or more filters unless they live in Alaska or Hawaii. International shipping requires a custom quote and may take slightly longer.

For U.S. orders, most filter sizes ship within two days, and delivery time typically takes between three to five business days. Custom orders usually ship within five days. If you aren’t happy with your purchase, Filter King allows for returns within 30 days. However, customers should know that they’ll be responsible for return shipping fees.

Is It Time To Change Your Air Filter?

It's important to know when to change your air filter out for a new one. Over time, trapped particles can build up to block airflow and ruin the efficiency of your filter. Changing the old filter out for a new one regularly ensures that you maintain your home's air quality.

How often you have to replace a furnace filter usually depends on quality. Filter king air filters can last for up to three months before needing replacement. The most obvious signs that it’s time to get a new filter include:

  • Visible dirt and debris covering the filter surface
  • An abnormally high heating bill
  • Fine dust buildup around the home
  • A burning or acrid smell around your HVAC system

MERV Rating: Which Should You Use?

The Minimum Efficiency Reporting Value, or MERV rating of a filter, tells you what kind of contaminants a particular unit can remove from the air. The MERV rating is based on how tightly woven the fibers and strands inside a filter are. The tighter the weave, the smaller the particles a filter can capture.

In general, homes and other residential buildings need an air filter with a MERV rating between just 8 and 12. Higher-rated filters tend to need more frequent replacing, as they trap more particulate matter, and so may not be the most economical choice for homeowners.

Higher rated filters are reserved for commercial buildings where you might find pollutants that aren’t common in the home. You often see filters with MERV ratings of 13 to 16 used in manufacturing plants, hospitals, pharmacies, and more.

Filter King furnace air filters 16x25x4 come in a choice of MERV 8, 11, or 13, making them ideal for both residential and commercial use. Each filter is able to block different types of particles, so it's important to be aware of MERV ratings before choosing the right filter for your home.

4-6 Rating: Recommended For Industrial Workplaces

Removes: Pollen, dust mites, carpet and clothing fibers, cockroach waste

Air filters with a MERV rating between 4 and 6 offer minimal filtration and can often be found in industrial environments and sometimes in rented residential units. They're a cost-effective way to improve indoor air quality. You can sometimes find 16x25x4 reusable air filter options with low MERV ratings to save on replacement costs.

8-13 Rating: Recommended For Home Use

Removes: Lead dust, Legionella bacteria, milled flour, welding fumes, dust from humidifiers and nebulizers, coal exhaust, smog.

Air filters with a MERV rating between 8 and 13 are the most common to be found in homes and certain commercial spaces. They filter media, including the most widespread allergens and irritants to keep air quality high.

The Filter King MERV 8 filter 16x25x4 can handle pollen, mold spores, and bacteria, as well as dust and dust mites. Going up to a higher MERV rating, the 16 x 25 x 4 MERV 11 can also filter out pet dander for homes with allergy sufferers.

  • Good: MERV 8 Filter
  • At a minimum, MERV 8 filter can be appropriate for most residential homes. It can block up to 90% of airborne contaminants such as dust, mold, and pollen. Recommended for use in basic and standard homes and businesses.

  • Better: MERV 11 Filter
  • MERV 11 filter is a mid-level filter, a step higher than MERV 8, and can remove a much higher percentage of contaminants including pet dander and allergens. Its recommended for homes with pets and people with mild allergies or anyone looking for further filtration.

  • Best: MERV 13 Filter
  • In addition to filtering everything that MERV 11 filters can do, MERV 13 air filter can filter out smoke, smog, and virus carriers. MERV 13 provides the highest level of filtration and is suitable for homes with people that smoke, have severe allergies, asthma, and other respiratory issues.

14 - 20 Rating: Recommended For Hospital & Laboratories

Removes: Bacteria and viruses, sneeze and coughing droplets auto emissions and fumes, tobacco smoke, insecticide dust, face powder, microns, radon, carbon dust, salt, combustion emissions.

Filters with a MERV rating between 14 and 20 offer the highest level of protection for indoor air quality. They're most often found in sterile commercial environments such as hospital wards or certain manufacturing units, as they block bacteria and virus particles.

FAQs: Common Questions

When Should I Change An Air Filter?

It’s recommended that you change your air filter every one to three months as needed. With a Filter King air filter, you’ll typically get around three months of average use before needing a replacement. However, if you’re living with pets or someone with allergy, it may be best to replace it a little bit sooner.

What MERV Rating Filter Should I Pick?

The MERV rating that you pick will largely depend on what you want to filter out of your house. You want something with a high enough rating to filter out major irritants and airborne allergens, but not so high that you end up restricting airflow.

If you need an air filter for your home, you should look for those with a MERV rating of 8, 11 and 13. You don’t have to change or clean the filter as often as one with a higher MERV rating. If you are living with pets in the house or someone that has respiratory problems, then I recommend you look at MERV 11 or 13 ratings for better filtration.

Do You Have Warranty On Your Filters?

Filter King does not come with a warranty on its furnace filters. However, they do offer a 30-day money-back guarantee for non-custom sizes. You can return the product in its original packaging for any reason within a 30-day window of purchase for a full refund. However, it's important to note that customers are responsible when it comes to the return shipping fees.

Do You Offer Discounts On Bulk Purchase?

You can save by buying more filters at once with Furnace King. Buying four or more filters at once can cut the cost of each by as much as 50%. You can purchase the Furnace King 16x25x4 air filter in packs of four, six, or twelve to save on replacement costs throughout the year.

Buying more filters at once also means that you’ll get free shipping for your order. Customers only need to order two or more filters at once to take advantage of Furnace King’s free shipping offer.

How Long Does The Shipment Take?

Shipping with Furnace King is fast, convenient, and with an order of two or more filters, free. Orders from within the contiguous U.S. generally take up to two days to process, while international and custom orders can take up to five days.

Once an order has gone through, shipping takes three to five business days for orders within the United States. Because the company operates out of Alabama, people living in nearby Louisiana and Mississippi tend to get their orders more quickly than those living in states further away.

Filter King: Air Filter Delivery Service

If you want to maintain the highest possible level of air quality in your home, you’ll have to replace your air filter regularly. In general, Filter King furnace filters last up to three months before needing replacement.

It can be difficult to remember to buy and install new filters on a regular schedule, especially if you lead a busy lifestyle. If you want to ensure you always receive replacement 16x25x4 air filters when it's time to replace your old ones, consider signing up for our air filter delivery service.

You can go online to set up a delivery schedule that suits your unique filtration needs. Simply select the size, MERV rating, and quantity of filters you’d like delivered to your doorstep. With the Filter King delivery service, shipping is free every time.