Shop 1-inch air filters for furnaces, air conditioners, and HVAC systems in hundreds of sizes. Simply Filters offers MERV 8, MERV 11, and MERV 13 1-inch air filters designed to help capture dust, pollen, pet dander, and other airborne particles while maintaining proper airflow through your HVAC system.
Whether you need a common 16x20x1, 16x25x1, 20x20x1, or 20x25x1 air filter or a harder-to-find size, Simply Filters makes it easy to find the right replacement filter for your home or business.
Finding the correct HVAC filter starts with the size printed on your existing filter. We offer a wide selection of 1-inch furnace and AC filter sizes, including many standard and hard-to-find dimensions.
Simply Filters 1-inch HVAC filters are available in multiple filtration levels, allowing you to choose the right balance of particle capture and airflow for your home.
MERV 8 air filters are a dependable choice for everyday residential HVAC filtration. They help capture common airborne particles such as dust, pollen, lint, and other household debris.
MERV 8 is a popular option for homeowners looking for reliable everyday filtration.
MERV 11 air filters provide enhanced filtration and can capture smaller airborne particles than MERV 8 filters.
They are a popular choice for homes with pets, seasonal allergens, and higher filtration needs while still being designed for residential HVAC systems.
MERV 13 air filters provide a higher level of particle filtration and are designed to capture smaller airborne particles.
Before moving to a higher MERV rating, check your HVAC system manufacturer's recommendations to make sure the system is designed for the filter you select.
BASIC PROTECTION
PERFECT FOR BASIC RESIDENTIAL & COMMERCIAL USE
ENHANCED PROTECTION
PERFECT FOR HOMES & WORKPLACES WITH PETS OR ALLERGIES
SUPERIOR PROTECTION
HOSPITAL-GRADE FILTRATION FOR MAXIMUM PROTECTION
A 1-inch air filter is one of the most common types of replacement filters used in residential furnaces, central air conditioners, and HVAC systems.
The filter is installed in the HVAC system's return-air path, where air passes through the filter media before circulating through the system and back into your home.
Although these filters are commonly called “1-inch filters,” the actual thickness is typically slightly less than one inch. This difference between nominal and actual dimensions is normal in HVAC filter sizing.
Precision fit, zero air bypass: Every filter is manufactured to true-to-size dimensions so air passes through the media, not around it.
Multi-pack savings built in: Choose from packs of 2, 4, 6, 8, or 12 and keep your home protected without the hassle of reordering every few weeks.
One of the most important things to understand when buying a replacement furnace filter is the difference between its nominal size and actual size.
The nominal size is the rounded size commonly printed on the filter. The actual size is the filter's precise physical measurement.
For example, a filter labeled 20x20x1 may measure slightly smaller than 20 inches by 20 inches by 1 inch.
Always check the size printed on your existing filter and, when necessary, measure the filter or HVAC filter slot before ordering.
Yes. Depending on your HVAC system, the same type of 1-inch HVAC filter may be referred to as a:
These terms frequently describe the same basic type of replaceable HVAC filtration product.
The most important factors when choosing a replacement are the correct filter dimensions, MERV rating, and compatibility with your HVAC system.
Many 1-inch HVAC filters should be checked regularly and replaced when dirty. Replacement frequency varies depending on your home and HVAC system.
Factors that can cause a filter to require more frequent replacement include pets, dust levels, allergies, HVAC runtime, construction or renovation activity, smoking, and indoor air conditions.
Rather than relying only on a fixed schedule, periodically inspect your filter. A visibly dirty or heavily loaded filter should be replaced.
Simply Filters makes replacing your HVAC filters simple.
Our 1-inch furnace and AC filters are made in the USA and available in a wide range of sizes, filtration levels, and pack quantities.
Whether you're replacing one of America's most common furnace filter sizes or searching for a difficult-to-find dimension, our goal is straightforward: help you find the right size, right MERV rating, and right air filter for your HVAC system.
Choose your size above to find the Simply Filters 1-inch air filter that fits your system.
