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20x20x1 MERV 8 Filter King Freedom Filters

Name: 20x20x1 Freedom Filters MERV 8 Air Filter
Brand: Filter King
SKU: FF20x20x1-M8
Price: 28.3 USD
Availability: InStock
Rating: 4.791489 (235 reviews)

Actual size: 19.5 x 19.5 x 0.75 inches

Choose filter quality

Filter guide

MERV 8 FREEDOM FILTERS MERV 8 MERV 11 MERV 13 ODOR ELIMINATOR

Freedom Filters MERV 8

Pleated air filters suitable for furnaces, ACs and residential HVAC systems

Learn more

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20x20x1 air filter description

SKU

FF20x20x1-M8
MERV rating

MERV 8
MPR rating

MPR 600
FPR rating

FPR 5
Filtration efficiency

90%
Odor eliminator

No
Captured particle size

3-10 microns
Lifespan

2-3 months

What does 20x20x1 MERV 8 air filter protect against?

MERV 8 filters remove up to 90% of common household particles including dust mites, pollen, pet dander, and mold spores. These filters provide basic air quality for standard homes without allergies.

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Fast & free shipping

Processed quickly, ships fast, free for all orders
Easy to return/exchange

Return your items within 30 days and get a full refund
All sizes available

Find your perfect fit with our complete size range

LIMITED EDITION FILTER FRAMES

What are Freedom Filters?

Freedom Filters is Filter King's limited-edition campaign to mark America's 250th anniversary. Available across seven popular 1-inch sizes, each filter features a patriotic frame design – a fitting way to mark this monumental milestone every time you change your filter.

The filtration is the same MERV 8 performance you'd expect from Filter King – capturing dust, pollen, mold spores, and pet dander – wrapped in a USA-themed frame you won't find anywhere else.

A portion of every sale goes to Big Dog Ranch Rescue's Veteran Service Dog Training Program, training and matching rescue dogs with veterans living with PTSD, TBI, or MST – at no cost to the veteran.

Who is the 20x20x1 MERV 8 air filter best for?

MERV 8 air filters are ideal for homes seeking improved air quality and standard filtration. These filters are best in homes where pet dander is lower and there are no risks of outdoor pollution or construction. MERV 8 air filters provide sustainable air filtration without a high efficiency system in place. They capture up to 90% of particles and are generally used in family homes and smaller offices.

When to replace your air filter?

For best indoor air quality, we recommend you change your HVAC or furnace air filters regularly at different times depending on your situation.

Asthma or allergies

Every 6 weeks

Replace your air filter every 6 weeks to minimize the circulation of bacteria and allergens in the air.
Pets

Every 2 months

Replace air filters every 2 months to reduce odors as well as pet dander and hair buildup in your system.
Young children

Every 2-3 months

Replace your air filter every 2-3 months to reduce airborne particles and maintain cleaner indoor air.

What happens if you don’t replace on time?

Your filter catches dust every day, but it can only hold so much. Once it's full, dirty air keeps circulating and your system has to work harder – leading to problems that spread through your whole home.

Higher energy bills

A clogged filter makes your system work much harder to push air through. That extra effort shows up on your energy bill.
Costly system breakdowns

When air can't flow through, your AC can freeze up in summer and your furnace can overheat in winter.
Stuffy, uncomfortable rooms

A dirty filter weakens your system's airflow, so some rooms end up too hot, too cold, or just plain stuffy.

MERV rating comparison

Recommended for

Comparable ratings

Filtration efficiency

Dust mites

10+ microns

Pollen

10-100 microns

Pet dander

5-10 microns

Lint and fabric fibers

10+ microns

Mold spores

3-10 microns

Fine dust

1-3 microns

Smoke particles

0.3-1 micron

Smog and fine particles

0.1-1 micron

Bacteria

0.3-5 microns

Virus carriers

0.3-1 micron

Wildfire smoke

0.4–2.5 microns

Odors and gases

Molecular level

VOCs

Molecular level

Cooking odors

Molecular level

Learn more

Basic air quality,
standard homes

FPR 5,
MPR 600

90% of common particles

MERV 8 filters

Better air quality, homes with allergies, pets

FPR 7,
MPR 1000-1200

95% of common particles

MERV 11 filters

Superior air quality, health concerns, allergies

FPR 10,
MPR 1500-1900

98% of common particles

MERV 13 filters

Odor control, cooking smells, pet areas

FPR 5 + Carbon,
MPR 600 + Odor

90% of common particles

Odor eliminator filters

What makes Filter King so good?

It comes down to using better materials. Click around to see how we build a stronger filter that actually protects your home.

Front beverage board frame

The diagonal straps die-cut into the frame bond to each pleat tip, keeping them evenly spaced so the filter won't bow.

MERV 8 pleated media

Traps up to 90% of everyday particles like dust mites, pollen, pet dander, and mold spores, while still letting air flow through freely.

Wire support grid

An expanded wire grid bonds to the media, stopping the pleats from shifting or pulling away under airflow.

Back beverage board frame

The same heavy-duty, moisture-resistant beverage board on the exit side holds its shape and keeps a tight seal in your vent or wall slot.

Activated carbon layer

A layer of activated carbon absorbs odor molecules from cooking, pets, and chemical fumes – catching what the filter media alone can't.

Customer reviews

How to find your air filter size?

Check the label on your current filter or use a tape measure to get the exact length, width, and depth before selecting your size.

Nominal size

Nominal size is what you normally see printed on the label. This is usually a rounded size which is often not the true size of your filter.

Actual size

Actual size is the true size of the air filter, usually written in smaller font below the nominal size.

Measuring

Measure your current air filter or the length, width, and depth of the opening slot to get the actual size. Round it up to the nearest whole inch to get the nominal size.

How to install 20x20x1 air filter?

Installing 20x20x1 air filters couldn't be easier. Just make sure to align the arrow printed on the side with the airflow direction!

1

Remove the air filter from the package
2

Locate the arrow and point it in the direction of the fan
3

Slide the filter in to the slot of the central unit
4

For return grills, insert the filter into the grill, pointing the arrow inwards

Without auto-delivery

Pay full price on every order
Need to remember to reorder every time you run out
Forget to reorder, and a dirty filter can drive up your energy bills.

With auto-delivery (save 5%)

Get 5% off every order, automatically
New filters arrive right when you need them
Pause, skip, or cancel anytime – no commitment needed.

Enable auto-delivery Get 5% off your first and all future subscription orders

Frequently asked questions

Frequently Asked Questions (FAQs)

Can I use a 20x20x2 filter in a 20x20x1 slot?

No, you cannot use a 20x20x2 air filter in a slot designed for 20x20x1. This is an improper size for the opening and will be too thick, which can strain your HVAC unit. This can cause damage overtime. In addition, it won't clean the air properly if it's improperly sized for your space. It doesn't save you anything much less money to have an improperly fitted filter either.

Can I wash and reuse my 20x20x1 pleated filter?

No, you cannot wash or reuse your 20x20x1 pleated filter from Filter King.

Will a higher MERV 20x20x1 filter make my system work harder?

Yes, a higher MERV 20x20x1 filter can make your system work harder. But, if your home is modern and your unit is new, it might be able to handle the extra filtration. If you want to improve your indoor air quality by increasing your filter rating, just make sure you check your unit guidelines and recommendations first.

How do I know if my filter is actually 20x20x1 or 19.5x19.5x0.75?

Well, by industry standards, these are the same thing. However, Filter King does offer a true-to-size filter that is designed for superior filtration. This also means your filter will fit perfectly as designed in your space as constructed and will reduce dust, pollen and more.

Why does my 20x20x1 filter get dirty faster in winter?

During the winter months, your HVAC system is likely to run much more frequently in order to keep your home comfortable. This means that, based on the increased use or your specific needs, you will likely need to opt for filter replacement more often. This is normal. Dust buildup along with even more pollen can be common as well.

Do all 20x20x1 filters have the same number of pleats?

No. The number of pleats will depend on the MERV rating, among other factors. So, not all filters have the same number of pleats.

20x20x1 MERV 8 Filter King Freedom Filters

Choose filter quality

Freedom Filters MERV 8

Select quantity

20x20x1 air filter description

What does 20x20x1 MERV 8 air filter protect against?

Choose how to buy

What are Freedom Filters?

Who is the 20x20x1 MERV 8 air filter best for?

When to replace your air filter?

Asthma or allergies

Pets

Young children

What happens if you don’t replace on time?

Higher energy bills

Costly system breakdowns

Stuffy, uncomfortable rooms

MERV rating comparison

What makes Filter King so good?

Front beverage board frame

MERV 8 pleated media

MERV 11 pleated media

MERV 13 pleated media

MERV 8 pleated media

Wire support grid

Back beverage board frame

Activated carbon layer

Customer reviews

How to find your air filter size?

Nominal size

Actual size

Measuring

How to install 20x20x1 air filter?

Set it and forget it with auto-delivery

Without auto-delivery

With auto-delivery (save 5%)

Frequently Asked Questions (FAQs)

Can I use a 20x20x2 filter in a 20x20x1 slot?

Can I wash and reuse my 20x20x1 pleated filter?

Will a higher MERV 20x20x1 filter make my system work harder?

How do I know if my filter is actually 20x20x1 or 19.5x19.5x0.75?

Why does my 20x20x1 filter get dirty faster in winter?

Do all 20x20x1 filters have the same number of pleats?