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Fiberglass Air Filters, MERV 3

69 stock sizes in 1 inch and 2 inch depths, plus custom fiberglass filters made to your dimensions.

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Find Your Size Custom Size Filters Text a Photo: (954) 588-7774

Mark and Michelle, founders of AC Filters 4 Less
“We’re passionate about ensuring you have the right filters for your home or business.”
Mark and Michelle, founders of AC Filters 4 Less
4.8 ★★★★★Google ratingRead reviews →
MERV 3 disposable fiberglass air filter in a cardboard frame

Fiberglass air filters are disposable MERV 3 HVAC filters made for basic equipment protection. They help keep lint and large dust from reaching your furnace or air conditioner. AC Filters 4 Less carries 69 stock sizes in 1 inch and 2 inch depths, plus custom fiberglass filters made to order in the USA.

Choose your size below. Fiberglass filters are MERV 3, disposable, made in USA, and should be changed every 30 days. If your size isn't listed, we can make a custom fiberglass filter to your dimensions.

Don't see your size? We make custom fiberglass filters, any size. 1 inch and 2 inch, about 2 weeks. See custom sizes or text (954) 588-7774.

Choose Your Fiberglass Air Filter Size

8x16x1MERV 3 Fiberglass$5.00 each$59.96 per case of 12Shop 8x16x1 8x30x1MERV 3 Fiberglass$12.33 each$147.99 per case of 12Shop 8x30x1 10x10x1MERV 3 Fiberglass$6.96 each$83.48 per case of 12Shop 10x10x1 10x20x1MERV 3 Fiberglass$7.21 each$86.52 per case of 12Shop 10x20x1 10x24x1MERV 3 Fiberglass$7.31 each$87.75 per case of 12Shop 10x24x1 10x25x1MERV 3 Fiberglass$7.34 each$88.04 per case of 12Shop 10x25x1 10x30x1MERV 3 Fiberglass$7.19 each$86.32 per case of 12Shop 10x30x1 12x12x1MERV 3 Fiberglass$5.61 each$67.38 per case of 12Shop 12x12x1 12x16x1MERV 3 Fiberglass$6.23 each$74.76 per case of 12Shop 12x16x1 12x18x1MERV 3 Fiberglass$6.30 each$75.65 per case of 12Shop 12x18x1 12x20x1MERV 3 Fiberglass$7.27 each$87.27 per case of 12Shop 12x20x1 12x24x1MERV 3 Fiberglass$4.58 each$54.98 per case of 12Shop 12x24x1 12x25x1MERV 3 Fiberglass$7.42 each$88.98 per case of 12Shop 12x25x1 12x30x1MERV 3 Fiberglass$6.68 each$80.21 per case of 12Shop 12x30x1 12x30-5/8x1MERV 3 Fiberglass$7.76 each$93.16 per case of 12Shop 12x30-5/8x1 12x36x1MERV 3 Fiberglass$6.90 each$82.81 per case of 12Shop 12x36x1 14x14x1MERV 3 Fiberglass$5.62 each$67.42 per case of 12Shop 14x14x1 14x18x1MERV 3 Fiberglass$6.36 each$76.37 per case of 12Shop 14x18x1 14x20x1MERV 3 Fiberglass$4.46 each$53.55 per case of 12Shop 14x20x1 14x24x1MERV 3 Fiberglass$6.20 each$74.35 per case of 12Shop 14x24x1 14x25x1MERV 3 Fiberglass$5.61 each$67.38 per case of 12Shop 14x25x1 14x30x1MERV 3 Fiberglass$6.80 each$81.58 per case of 12Shop 14x30x1 15x20x1MERV 3 Fiberglass$5.61 each$67.38 per case of 12Shop 15x20x1 15x25x1MERV 3 Fiberglass$7.53 each$90.40 per case of 12Shop 15x25x1 15x30x1MERV 3 Fiberglass$8.52 each$102.28 per case of 12Shop 15x30x1 15x30-5/8x1MERV 3 Fiberglass$7.91 each$94.88 per case of 12Shop 15x30-5/8x1 16x16x1MERV 3 Fiberglass$6.33 each$76.01 per case of 12Shop 16x16x1 16x18x1MERV 3 Fiberglass$7.35 each$88.23 per case of 12Shop 16x18x1 16x20x1MERV 3 Fiberglass$5.61 each$67.38 per case of 12Shop 16x20x1 16x22-1/4x1MERV 3 Fiberglass$7.49 each$89.93 per case of 12Shop 16x22-1/4x1 16x24x1MERV 3 Fiberglass$4.82 each$57.86 per case of 12Shop 16x24x1 16x25x1MERV 3 Fiberglass$5.61 each$67.38 per case of 12Shop 16x25x1 16x30x1MERV 3 Fiberglass$6.87 each$82.43 per case of 12Shop 16x30x1 18x18x1MERV 3 Fiberglass$7.49 each$89.85 per case of 12Shop 18x18x1 18x20x1MERV 3 Fiberglass$6.54 each$78.43 per case of 12Shop 18x20x1 18x24x1MERV 3 Fiberglass$5.00 each$59.99 per case of 12Shop 18x24x1 18x25x1MERV 3 Fiberglass$6.71 each$80.57 per case of 12Shop 18x25x1 18x30x1MERV 3 Fiberglass$7.00 each$84.06 per case of 12Shop 18x30x1 18x36x1MERV 3 Fiberglass$7.61 each$91.31 per case of 12Shop 18x36x1 19x27x1MERV 3 Fiberglass$7.92 each$95.07 per case of 12Shop 19x27x1 20x20x1MERV 3 Fiberglass$4.68 each$56.15 per case of 12Shop 20x20x1 20x22-1/4x1MERV 3 Fiberglass$7.70 each$92.41 per case of 12Shop 20x22-1/4x1 20x24x1MERV 3 Fiberglass$5.03 each$60.35 per case of 12Shop 20x24x1 20x25x1MERV 3 Fiberglass$4.91 each$58.90 per case of 12Shop 20x25x1 20x30x1MERV 3 Fiberglass$6.27 each$75.20 per case of 12Shop 20x30x1 20x36x1MERV 3 Fiberglass$18.70 each$224.35 per case of 12Shop 20x36x1 21x21x1MERV 3 Fiberglass$7.80 each$93.65 per case of 12Shop 21x21x1 22x22x1MERV 3 Fiberglass$6.80 each$81.56 per case of 12Shop 22x22x1 24x24x1MERV 3 Fiberglass$6.47 each$77.60 per case of 12Shop 24x24x1 24x30x1MERV 3 Fiberglass$8.03 each$96.39 per case of 12Shop 24x30x1 24x36x1MERV 3 Fiberglass$10.09 each$121.04 per case of 12Shop 24x36x1 25x25x1MERV 3 Fiberglass$5.83 each$70.01 per case of 12Shop 25x25x1
10x10x2MERV 3 Fiberglass$6.74 each$80.87 per case of 12Shop 10x10x2 10x20x2MERV 3 Fiberglass$7.03 each$84.31 per case of 12Shop 10x20x2 12x24x2MERV 3 Fiberglass$6.05 each$72.58 per case of 12Shop 12x24x2 14x20x2MERV 3 Fiberglass$5.85 each$70.15 per case of 12Shop 14x20x2 14x25x2MERV 3 Fiberglass$5.26 each$63.13 per case of 12Shop 14x25x2 15x20x2MERV 3 Fiberglass$7.21 each$86.53 per case of 12Shop 15x20x2 16x16x2MERV 3 Fiberglass$9.21 each$110.46 per case of 12Shop 16x16x2 16x20x2MERV 3 Fiberglass$5.04 each$60.44 per case of 12Shop 16x20x2 16x24x2MERV 3 Fiberglass$5.54 each$66.53 per case of 12Shop 16x24x2 16x25x2MERV 3 Fiberglass$5.26 each$63.13 per case of 12Shop 16x25x2 18x24x2MERV 3 Fiberglass$5.80 each$69.57 per case of 12Shop 18x24x2 18x25x2MERV 3 Fiberglass$14.02 each$168.24 per case of 12Shop 18x25x2 20x20x2MERV 3 Fiberglass$6.23 each$74.80 per case of 12Shop 20x20x2 20x24x2MERV 3 Fiberglass$7.70 each$92.36 per case of 12Shop 20x24x2 20x25x2MERV 3 Fiberglass$10.22 each$122.61 per case of 12Shop 20x25x2 24x24x2MERV 3 Fiberglass$6.96 each$83.50 per case of 12Shop 24x24x2 25x25x2MERV 3 Fiberglass$7.72 each$92.60 per case of 12Shop 25x25x2
Custom size fiberglass air filter showing the width, height and depth to measure

Custom Fiberglass Air Filters, Any Size

Don't see your size? We make it. Custom fiberglass filters in 1 inch and 2 inch depths, from 4x4 up to 24.5x35.5 inches. Doubles go up to 24.5x71 or 35.5x49.

$80 to $190 for a case of 12, depending on size. About 2 weeks. Made to order in the USA, 1/8 inch tolerance, not returnable. We confirm your size before we build.

Measure width, height and depth in inches. Not sure? Text us a photo.

Get a Custom QuoteText (954) 588-7774

Need something other than fiberglass? See polyester MERV 5 or pleated MERV 8 to 13 filters, or all custom options.

Reviews from Satisfied Customers
5 Stars
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Our central A/C requires a hard-to-find filter size. AC Filters 4 Less has gone out of their way to make sure we get the exact right size at a fair prize. A professional and friendly business--I highly recommend!
RK
Randy Kurtz
5 Stars
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I ordered filters and I accidentally put in my incorrect home address. FedEx delivered the filters to the incorrect address. Even though I tried to resolve the issue with FedEx that same day they were not helpful AC filters for last was on top of it right away they were excellent with customer service. They took care of me. They resent filters to my correct address at no additional charge. We are still trying to resolve the other box with FedEx but from start to finish this company is five star customer service Carol Annie Wakeling.
William Wakeling
William Wakeling
5 Stars
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Mark with AC Filters 4 Less is ALWAYS on top of things regarding my orders. He's got this and then some. Way to Go!!!
Tom Keady
Tom Keady
5 Stars
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A/C Filters 4 Less is one of the best companies I have ever dealt with. Their prices and knowledge are the very best. I can't say enough about how great their customer service is, which we all know is very rare these days. I ordered the wrong filters by mistake and Mark went out of his way to help me - he was more than fair! I plan on ordering all my filters from them in the future. I would give them 10 stars if I could!
Bonnie Wolf
Bonnie Wolf

Our Other MERV Rating Filters

Looking for more filtration options? Explore our full MERV lineup: from basic fiberglass MERV 3 filters to pleated filters up to MERV 13.

Polyester air filters MERV 5 and 6: durable filters for light commercial or residential HVAC systems

Shop MERV 5/6 Polyester Filters

Durable everyday filtration

Pleated air filters MERV 8: affordable filters for AC and furnace systems, ideal for capturing dust, pollen, and pet dander while maintaining strong airflow

Shop MERV 8 Pleated Filters

A practical choice for most homes

Pleated air filters MERV 10: high-efficiency filtration for better indoor air quality

Shop MERV 10 Pleated Filters

More particle capture, balanced airflow

Pleated air filters MERV 11: captures fine dust, pollen, and pet dander for cleaner airflow

Shop MERV 11 Pleated Filters

Stronger filtration for pets and allergies

MERV 13 pleated air filters: premium filtration for allergens, bacteria, and smoke particles

Shop MERV 13 High-Efficiency Filters

Higher filtration for compatible systems only

Fiberglass Air Filter FAQs

Are fiberglass air filters disposable?

Yes. Fiberglass filters are made to be used once and thrown away. Do not wash or reuse them. Replace every 30 days, sooner with pets or a lot of dust.

Can you make a custom fiberglass air filter?

Yes. We make custom MERV 3 fiberglass filters in 1 inch and 2 inch depths, from 4x4 up to 24.5x35.5 inches. Bigger openings take a double filter, up to 24.5x71 or 35.5x49 inches. Use the custom quote form, text (954) 588-7774, or call.

How much does a custom fiberglass air filter cost?

Custom fiberglass filters run $80 to $190 for a case of 12, depending on size. Send us your width, height, depth and quantity. We confirm the size and price before we build anything.

How long does a custom fiberglass filter take?

About 2 weeks. Each order is made to order in the USA after we confirm your size.

How do I measure for a custom fiberglass filter?

Measure width, height and depth in inches. Not sure? Text us a photo at (954) 588-7774 and we'll help you confirm the size.

How accurate are custom fiberglass filter sizes?

Within 1/8 inch. Every custom filter is made to order, so we confirm your size with you before we build it.

Can you make oversized fiberglass filters?

Yes. Bigger openings take a double filter, up to 24.5x71 or 35.5x49 inches. Send us the size and we'll tell you if we can make it.

Can I return a custom fiberglass filter?

No. Custom filters are made to order and are not returnable. That's why we confirm your size before we build.

How do I order a custom fiberglass filter?

Use the custom quote form, text (954) 588-7774, or call. We confirm your size and price before we build.

What is a MERV 3 fiberglass air filter?

A MERV 3 fiberglass filter is a disposable filter that protects your furnace or AC from lint and large dust. For higher filtration, step up to polyester MERV 5 or pleated MERV 8 to 13.

How often should I change a fiberglass air filter?

Every 30 days. Fiberglass filters are disposable, so replace them instead of washing them.

Are fiberglass air filters reusable?

No. They are disposable. Replace the filter every 30 days.

What sizes of fiberglass air filters do you carry?

We carry 69 stock sizes: 52 in 1 inch and 17 in 2 inch. If your size isn't listed, we make custom fiberglass filters in 1 inch and 2 inch depths from 4x4 up to 24.5x35.5 inches.

More: shop air filters by size, compare MERV ratings, 1 inch air filters, 2 inch air filters.

Not sure which filter you need?
Text a photo of your old filter. Real people answer.
Text (954) 588-7774
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