4" Filters
Premium 4-Inch HVAC Filters for Superior Air Quality
4-inch air filters offer some of the best overall performance available for residential HVAC systems. With significantly more pleated surface area, these filters capture a higher volume of airborne contaminants over a longer period of time—making them a favorite among homeowners seeking top-tier air purification.
Why 4-Inch Filters Are Considered “Premium”
Compared to 1-inch and 2-inch filters, 4-inch filters deliver:
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Superior dust and allergen capture
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Reduced airflow restriction
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Longer replacement cycles (up to 6–12 months)
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Increased HVAC efficiency
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Better long-term cost savings
Because they trap contaminants across a larger media surface, these filters maintain strong airflow while still capturing fine particles.
Popular MERV Options
4-inch filters are available in high-performance MERV levels:
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MERV 8: Basic protection for dust, pollen, and household particles.
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MERV 11: Enhanced filtration ideal for pets, allergies, and finer particles.
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MERV 13: Highest residential filtration—captures bacteria, smoke, and microscopic pollutants.
MERV 13 is frequently recommended for homes affected by smoke, allergies, or compromised air quality.
Best-Selling Size: 20x25x4
One of the most popular 4-inch filter sizes is 20x25x4, commonly used in modern HVAC systems. This size fits many high-efficiency air handlers and provides excellent airflow, long service life, and enhanced purification.
Ideal for Allergy, Asthma, and Smoke Sensitivities
Because of their ability to capture ultra-fine particles, 4-inch filters are perfect for households with:
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Seasonal or chronic allergies
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Smoke sensitivity (including wildfire smoke)
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Pets that shed or produce dander
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Respiratory conditions
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Homes near busy roads or industrial areas
Designed for High-Efficiency HVAC Equipment
Many newer HVAC systems recommend or require 4-inch filters because of their efficiency and airflow stability. If compatible with your system, upgrading to a 4-inch filter can reduce wear on your equipment, lower utility costs, and improve temperature balance throughout your home.
Long-Lasting, Low-Maintenance Performance
With extended service life, 4-inch filters provide consistent filtration for months at a time. This makes them ideal for busy households and for customers who want fewer maintenance reminders.
Shop Top-Quality 4-Inch Filters
Our selection includes multiple MERV ratings, premium brands, and the most common 4-inch sizes. Whether upgrading your home system or replacing an existing filter, you’ll find durable, high-efficiency options that improve air quality and protect your HVAC investment.
Need assistance or forgot what you ordered last time?
No problem! Call us at (877) 943-4587 or email us at info@filtermarket.com!
Wondering what kind of filter is best for you? Learn all about the Minimum Efficiency Reporting Value (MERV) here!
