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20x23x1 MERV 8 Air Filters

Name: 20x23x1a MERV 8 Air Filter
Brand: Filter King
SKU: FK20x23x1a-M8
Price: 35.13 USD
Availability: InStock
Rating: 4.759036 (83 reviews)

Actual size: 20 x 23 x 0.75 inches

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Filter guide

MERV 8 MERV 11 MERV 13 ODOR ELIMINATOR

Standard

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

Learn more

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20x23x1 air filter description

SKU

FK20x23x1a-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 MERV 8 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

Who is the 20x23x1a MERV 8 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 20x23x1 air filter?

Installing 20x23x1 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

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

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Frequently asked questions

Frequently Asked Questions (FAQs)

What is the actual size of a 20x23x1 air filter?

The actual size of a 20x23x1 air filter is 19.5x22.5x0.75 inches. Our filters are half an inch smaller than the nominal size to ensure they fit perfectly into the slot.

How often should I replace my 20x23x1 air filter?

You should replace your 20x23x1 air filter every 30 to 90 days. Homes with pets, indoor smokers, or allergy sufferers may need to replace their filters more frequently.

Can I wash and reuse my 20x23x1 pleated filter?

No, most 20x23x1 pleated filters cannot be washed and reused. These filters are designed to be disposable and should be discarded upon replacement. Any attempt to wash a disposable filter will destroy its fibers and render it ineffective.

Will a MERV 13 20x23x1 filter restrict too much airflow?

A MERV 13 20x23x1 filter may restrict airflow in older or lower-capacity HVAC systems. Restricted airflow can lead to uneven heating and cooling, increased energy bills, and premature component wear and tear. Consult your HVAC manual to determine system compatibility.

Is 20x23x1 the same as 20x23?

Yes, whether it's labeled 20x23x1 or 20x23, it's the same air filter. The x1 confirms a 1-inch filter thickness, but this is already implied by the standard 20x23 description.

Can I stack two 20x23x1 filters for better filtration?

No, you should never stack 20x23x1 filters together to improve filtration. Stacking filters restricts airflow, which can cause your HVAC system to run longer to heat or cool your property. This can result in increased utility bills and accelerated wear and tear on your unit.

Why does my 20x23x1 filter get dirty so quickly?

If your 20x23x1 filter dirties quickly, it's likely because of household and/or environmental air conditions. High volumes of dust, pet dander, lint, debris, and other airborne particles can cause a filter to dirty faster than normal. Environmental pollutants and high pollen counts can also accelerate filter dirtying.

Can I use a 20x24x1 filter instead of a 20x23x1?

No, using a 20x24x1 filter rather than a 20x23x1 is not recommended. This is because a 20x24x1 is larger and will likely not fit perfectly into the slot. This can result in a tighter fit and reduced airflow, impacting system efficiency. Only use the air filter size that your HVAC unit is designed to handle.

20x23x1 MERV 8 Air Filters

Choose filter quality

Standard

Select quantity

20x23x1 air filter description

What does MERV 8 protect against?

Choose how to buy

Who is the 20x23x1a MERV 8 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 20x23x1 air filter?

Set it and forget it with auto-delivery

Without auto-delivery

With auto-delivery (save 5%)

Frequently Asked Questions (FAQs)

What is the actual size of a 20x23x1 air filter?

How often should I replace my 20x23x1 air filter?

Can I wash and reuse my 20x23x1 pleated filter?

Will a MERV 13 20x23x1 filter restrict too much airflow?

Is 20x23x1 the same as 20x23?

Can I stack two 20x23x1 filters for better filtration?

Why does my 20x23x1 filter get dirty so quickly?

Can I use a 20x24x1 filter instead of a 20x23x1?