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20x30x1 Air Filter Glasfloss ZL Series MERV 10 – Box of 12

Actual Size: 19-5/8 x 29-5/8 x 7/8
  • SKU: ZLP20301
  • MERV 10 performance with the no more resistance than MERV 8
  • Compare to MPR 900-1000, or FPR 7
  • Moisture Resistant, Heavy-Duty Construction
  • Eco-Friendly Design with Post-Consumer Materials
  • Easy to Install and Remove
  • 100% Synthetic Fibers Won’t Support Microbial Growth
  • 3 Month (90 day) Air Filter.
  • How Often Should I Change My Air Filters?


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The Glasfloss MERV 10 Z-Line 20x30x1 air filters excel at removing allergens and dust from the air, making your home’s air cleaner. We designed the sturdy frame using heavy-duty, moisture-resistant materials, including recycled content, to make it easy to install and remove from your HVAC system. The synthetic fibers in the filter media won’t support mold growth or absorb moisture. By thermally bonding all parts together, we ensure extra durability. Choose these filters for their reliability and effectiveness in both homes and businesses.

About Air Filter Sizing

There are two main ways to refer to air filters: their Nominal size and their Actual size. The Nominal size is a simplified version of the dimensions of the filter and is how it is typically labelled and sold. The Actual size, however, is the exact dimensions of the filter. Some filters may have the same Nominal size, but different exact dimensions, which is why the actual size is important when it comes to ordering filters. For more information, please see our article "Nominal vs. Actual Air Filter Size”

MERV 10 Can Capture

MERV 10 Efficiency

MERV 10 air filters offer an upgrade from MERV 8 without making your system work harder or adding resistance. They are great for removing many allergens and providing better indoor air quality to your home or business.

How often should I change this air filter?

While we give an estimated life of each filter, how often your air filter needs to be changed depends on your individual situation. How many people live/work in your space, if you have pets, and even your location and time of the year can all affect how quickly your air filter gets dirty. We recommend checking your filter once a month to keep track of how dirty it’s getting. Check out our video explaining this in more detail on our “Air Filter Change Frequency” page.

How often to change your air filter.
Made in USA

Made in the USA

All Glasfloss air filters are proudly made in the USA in five manufacturing facilities across the country. Florida, Ohio, Texas, Nevada and Wisconsin.

Customer Reviews
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Filter Reviews:
Regan P.
United States United States
I recommend this product

Learned more

Reading more at you site I learned how to determine best interval between changes and how to predict dirty filter by finding dust built up on the intake fins. I thought it was a 3 month thing but now I see it needs a change out each month. Added dogs and cats account for the difference Thanks!

Susan B.
United States United States
I recommend this product

20x30x1 Air Filter Glasfloss ZL Series MERV 10 - Box of 12

I replaced the duct work in my house in March 2023. My house had been so dusty due to the condition of the outdated ducts. (1980) This filter is the same one that was installed at the time of the new ducts in March. The one that was replaced on 8/21/2023 was gross. I unknowingly went beyond the 3-month replacement recommendation. I have noticed a decrease in the amount of dust that accumulates on all the flat surfaces in my home and my daughters sneezing has almost ceased. It will be interesting to see what the filters look like when I change them in November. This filter is doing a great job.

Duane B.
United States United States
I recommend this product

AFU review

Just installed first one. Expect it to trap twice as much as our last ones. Should have to change it every month. No problems ordering or shipping. Good price. Contact me in January 2024 for product review

Michael T.
United States United States
I recommend this product

Always use you

Always good.. just keep your prices fair

Nanette F.
United States United States
I recommend this product

Excellent Filters!

Glasfloss filters are the best! They are great quality and at a good price. I ordered on Sunday and they arrived on Wednesday. Excellent service!!