4 Inch Air Filters
111 products
4-Inch HVAC & Furnace Filters
When it's time to replace your 4-inch filters, avoid paying for international sourcing and shipping fees by choosing 4-inch air filters from Factory Direct Filters. Each of our products is made in America and manufactured in our own facilities, allowing us to offer you the best price in the market. Our 4-inch furnace filters come in every size, from standard 14x4 air filters to custom measurements you can't find at the big box stores.
Remove Allergens, Dust, & More with 4" Air Filters
Depending on the MERV rating you choose, your 4-inch AC filter can capture and remove a wide variety of debris in your office or residential property. After selecting the measurements you need, choose your filtration efficiency and optimal air quality with your preferred MERV rating. If you aren't convinced, check out a few of the features that make our 4-inch air filters exceptional:
- Available in all sizes
- Lowest prices and free shipping
- Can reduce energy costs by up to 15%
- Made in the USA
- Opportunity to enhance the quality of your air with a higher MERV rating
Get free shipping and high filtration efficiency with our 4-inch air filters!
Select your specific 4-inch filter measurements below or create your own custom size
Do you suffer from allergies or have pets? If so, consider upgrading to a MERV 11 or MERV 13 air filter. These higher quality filters are better at trapping various allergens, pet dander, and other household pollutants and irritants.
Our Aerostar filters are made in the USA with high quality materials and will work with any brand of HVAC, furnace, or ac unit.
Consider joining our Subscribe and Save program and never worry about having a clean air filter again. Members get 5% off every auto-shipped order!
Recently viewed
Save 10% on your first purchase when you sign up!
Subscribe today and get special offers and more delivered right to your inbox!
4 Inch Air Filters FAQs
Because of its large filtration surface and long lifespan, a 4-inch air filter is a dependable option for keeping indoor air healthier. Its design reduces the need for frequent replacements, lowering energy costs while trapping pollutants to provide a healthier airspace.
Switch out your 4-inch furnace filter every 6 to 12 months. If you have smokers, pets, or higher dust levels around your home, you might want to consider changing your filter more often. Periodically inspect your filter so it doesn’t clog up. Neglecting to change it can damage your HVAC unit and affect your air quality.
Due to its greater thickness and surface area, a 4 inch HVAC filter has some advantages over a 1-inch filter. Its size provides more airflow and catches more airborne particles, including dust, pollen, and pet dander. They save money over time because they don’t need to be replaced as often as thinner filters. In addition to providing more effective filtration and HVAC efficiency, their snug fit lessens the possibility of unfiltered air escaping the system.
Some HVAC systems can’t accommodate a 4 inch thick air filter. Using a filter that’s too thick will strain your unit while restricting air circulation. Installing a 4 inch filter that is supposed to use a 1 inch or 2 inch filter could have a negative impact on your airflow as well as your HVAC system. Before you switch, check your manual so you’re aware of the proper filter you should use.
The compatibility of your HVAC system and your specific air quality requirements will help you determine which MERV rating is best for your 4-inch filter. To balance filtration and airflow, use 4 inch filters with MERV 8 to MERV 13 ratings.
Using a 4-inch filter contributes to energy savings by making HVAC perform more efficiently and minimizing airflow resistance. It circulates healthy air while reducing the workload on your system. Because it places less strain on the blower motor, the unit runs more efficiently, lowering energy usage and reducing energy costs by approximately 15%.
By lowering airborne contaminants, a 4-inch filter improves filtering and delivers higher air quality. It reduces exposure to allergens and irritants due to its deeper pleats. It lowers the likelihood of your HVAC system becoming clogged or damaged while maintaining cleaner indoor air for your health and also your family’s.
Effective features of pleated 4 inch air filters, composed of cotton or polyester, are durability and high filtration. Less effective in capturing microscopic particles, fiberglass filters are an affordable alternative to pleated filters, providing adequate airflow. The porous material used to make activated carbon filters allows them to absorb odors, contaminants, and volatile organic compounds (VOCs), which makes them ideal for purifying the air. Steel mesh or aluminum washable filters are reusable and can be cleaned and used repeatedly.
A pleated 4-inch air filter with higher MERV ratings filters better than a fiberglass filter due to its accordion design and dense material. Pleated filters trap smaller particles like pet dander, pollen, allergens, dust, and pet dander. Pleated filters have increased air purification capabilities, creating a healthier environment. Fiberglass filters need to be replaced every 30 days.
To avoid obstructing airflow, turn off your HVAC system before installing a 4-inch furnace filter. Locate the filter slot located close to the return air duct. Carefully remove the old filter, being mindful of the arrow direction on its frame. Make sure it fits properly. When you insert the new one, the airflow arrow should face in the same direction as the old one. Restart your HVAC system, and check the airflow.
Using a 4-inch air filter can be a benefit if you suffer from allergies and asthma because it filters out more airborne irritants than thinner filters. The deeper pleats allow it to catch finer particles, preventing them from circulating in your indoor space. They reduce your exposure to allergens, causing fewer respiratory problems.