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Home comfort made simpler

Cleaner air.
Less guesswork.

Find the right air filter for your home, property, or business — with straightforward sizing help and dependable ordering.

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✓ Shop by size✓ Compare filtration levels✓ Bulk options
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Start with the number on your current filter

Shop by filter size

Choose a common size below, or use our sizing help if you are not sure what you need.

16×20×1Shop size → 16×25×1Shop size → 20×20×1Shop size → 20×25×1Shop size → 14×20×1Shop size → 14×25×1Shop size → 12×24×1Shop size → 20×30×1Shop size → 24×24×1Shop size → 16×24×1Shop size →
See all filter sizes Help me find my size
Choose your filtration level

Shop by MERV rating

Different homes have different needs. Compare common filtration levels and choose the balance that works for your space.

8
Everyday

MERV 8

A practical choice for routine household dust and everyday HVAC protection.

Shop MERV 8 →
Popular choice
11
Enhanced

MERV 11

Stronger everyday filtration for homes looking to capture more fine household particles.

Shop MERV 11 →
13
Higher efficiency

MERV 13

Higher-efficiency filtration for systems designed to handle greater resistance.

Shop MERV 13 →

Always follow your HVAC system manufacturer's filter recommendations when selecting a MERV rating.

↔Filter measurement photo or diagramShow where to read nominal size and how to measure a filter.
Not sure what size you need?

Find the right fit before you order.

Air filters are labeled with a nominal size, but the actual dimensions can be slightly smaller. Our sizing guide makes it easier to identify the right replacement.

  • Locate the size printed on your current filter
  • Learn the difference between nominal and actual dimensions
  • Measure the existing filter when the label is missing
Find My Filter Size
More ways to shop

Find filters faster

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1″

1-inch filters

Common residential replacements
2″

2-inch filters

More media depth
4″

4-inch filters

Deeper media options
▦

Bulk filters

For multiple properties or facilities
A simpler replacement routine

Don't let your next filter change sneak up on you.

Filters Work is built around making repeat purchases easier. Shop your preferred size now and keep your replacement schedule simple.

Shop Replacement Filters
1Choose your size
2Select filtration
3Reorder when needed
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Heating & cooling

Comfort beyond filters.

Explore mini split systems for targeted heating and cooling in bedrooms, additions, garages, workshops, and other spaces.

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For businesses & properties

Ordering for more than one HVAC system?

Make recurring filter purchases easier for rental properties, offices, maintenance teams, commercial spaces, and multi-unit buildings.

  • Multiple sizes in one request
  • Recurring property needs
  • Simple bulk-order inquiry
Request Bulk Pricing
▤Bulk order / property maintenance photoUse boxes of filters, a property manager, warehouse shelving, or maintenance imagery.
Why Filters Work

A straightforward way to shop for home comfort.

⌕

Easy to find

Shop by familiar sizes, filtration level, and product type instead of digging through a complicated catalog.

✓

Clear guidance

Helpful sizing and product information supports a more confident purchase.

⌂

Built for real homes

From routine filter replacements to mini split comfort, the site stays focused on practical needs.

▦

Ready for bigger orders

Bulk ordering support is available for customers managing several systems or properties.

Learn before you buy

The Comfort Guide

Helpful, plain-language HVAC and indoor comfort information.

View all guides →
Questions before ordering?

We're here to make filters easier.

Start with these common questions, then visit our full FAQ for more help.

See all FAQs →
How do I know what size filter to buy?

Start with the size printed on your existing filter. If the label is missing, measure the filter and compare the actual dimensions with the nominal size used by manufacturers.

What MERV rating should I choose?

The right rating depends on your HVAC system and filtration goals. Higher is not automatically better for every system, so follow equipment recommendations.

Can I order filters for several properties?

Yes. Use the bulk-order page to tell us the sizes and quantities you need for multiple systems or locations.

Ready when you are

Better air starts with the right filter.

Find your size, compare your options, and get back to enjoying your space.

Find My FilterShop Air Filters

The Right Air Filters, Delivered When You Need Them

Shop quality air filters for your home, business, or HVAC system. Find common sizes, compare MERV ratings, and get help choosing the right filter.

Shop Air Filters
Find My Filter Size
Bulk Orders
Mini Splits

Why shop with Filters Work?

  • Common Air Filter Sizes
  • Merv 11 and Merv 13 Options
  • Bulk Order Support
  • Help finding the right filter size

Ready to find the right air filter size?

Start with the right size, choose the right MERV rating, and order filters for your home, business, rental, or facility.

Shop Air Filters

Find My Filter Size

  • Save on Bulk Orders
  • Choose When Filters Get Delivered
  • Skip or Cancel When You Want
Learn More

Cleaner Air Starts With the Right Filter

Frequently Asked Questions

Common Questions About Air Filters

Not sure which filter you need? These answers will help you choose the right size, MERV rating, and replacement schedule for your home.

How do I know what size air filter I need?

Most filters have the size printed on the cardboard frame. Look for numbers like 16x20x1, 20x25x1, or 20x25x4.

Where can I find my filter size if it is not printed on the filter?

Check the filter slot near your furnace, air handler, or return air grille. You can also measure the old filter with a tape measure.

What does MERV mean?

MERV stands for Minimum Efficiency Reporting Value. It tells you how well a filter captures particles like dust, pollen, and pet dander.

Should I choose MERV 11 or MERV 13?

MERV 11 is a strong everyday choice for most homes. MERV 13 offers higher filtration and may be better for homes with allergies, pets, or indoor air quality concerns.

How often should I replace my air filter?

Most 1-inch filters should be replaced every 30 to 90 days. Homes with pets, allergies, heavy dust, or frequent HVAC use may need replacements more often.

Can a dirty air filter affect my HVAC system?

Yes. A dirty filter can restrict airflow, make your system work harder, reduce comfort, and increase wear on your HVAC equipment.

What if I do not see my filter size listed?

Some homes use less common filter sizes. If you do not see your size, check the exact measurements on your current filter or contact Filters Work for help.

Do you offer bulk air filter orders?

Yes. Bulk air filter orders are useful for property managers, landlords, businesses, maintenance teams, and homeowners who want extra filters on hand.

Can I get help choosing the right filter?

Yes. Filters Work can help you choose the right size, MERV rating, and replacement schedule for your home.