Why Choose 4-Inch Furnace Filters?

There are many advantages to using 4 inch furnace filters over standard 1 inch filters . They trap more pollutants that float in the air, like dust, pollen, mold spores, & pet dander. Our 4 inch furnace filters also trap micro-particles that can affect the air quality in your home. 

These HVAC filters are great for homes with allergy sufferers, asthmatics and anyone sensitive to airborne irritants. 4-inch filters typically last 6-12 months, which is longer than the 1–3-month life span of 1-inch filters. 

They last longer, which means fewer frequent changes and, in the long run, less hassle and a more affordable price. If you’re currently using a thinner heater air filter, switching to a 4-inch furnace filter is an investment in your family’s health and the durability of your HVAC system.

Shop Online and Save More Than on Amazon

Shopping online for furnace filters has never been easier, and United Filter is here to make the process smooth and effortless. We have a variety of 4 Inch furnace filters available at the lowest price you can find anywhere. We work hard to maintain the quality of our products and keep our prices competitive because we want to sell our 4 inch furnace filters at lower prices than Amazon. 

Direct purchases from us mean no extra markup with huge savings. From high-efficiency MERV furnace filters to hard-to-find sizes such as 20x25x5 furnace filters , our extensive inventory offers something for every filter requirement. Not to mention that our easy-to-use site lets you view, compare, and buy filters with ease from home.

Find the Perfect Fit

Selecting the furnace filter size and type is important for the optimal function of your HVAC unit. United Filter has you covered with sizes like the common 16 x 20 x 1 furnace filters , 16 x 24 x 1 furnace filters , and hard-to-find sizes such as 20x25x5. 

Our 4 inch furnace filters will fit most HVAC systems, ensuring our filters to create the perfect fit with a tight seal for your filtration needs. Not sure what size or MERV rating your system requires? No problem. 

Our dedicated customer service team will help guide you. If sized properly and with the correct level of filtration, your new 4 inch furnace filters will enhance your home’s air quality without straining your HVAC system.

Better Air Quality for Your Home

Not only does a clean furnace air filter protect your HVAC system, but it also helps improve the air that you and your family are breathing. Good home air filters can eliminate allergens, respiratory irritants and other harmful substances. 

This is especially vital in homes with pets, whose dander can build up quickly, or in areas where pollen counts are high. Selecting suitable MERV furnace filters makes an impact on trapping these irritants and establishing a cleaner, healthier indoor environment. 

Plus, the better air cuts back on stress to your HVAC system, which makes it run more efficiently and last longer — a double-feature win for your health and your pocketbook.

Why Buy 4 Inch Furnace Filters From United Filter?

Our mission is to provide value, quality, and convenience. Made of high-performance materials, our furnace filters are designed to filter out 90% of allergens and last longer. 

We are here with a better shopping experience, offering fast shipping, a lot of filter sizes, and low prices so that you can save more money. We stand behind our product and make sure it meets your expectations or above. It's never been easier to replace your 4 inch furnace filters, and when you shop with us, you’re choosing better air quality and smarter savings.

Get your home’s air quality under control right now. Shop our range of 4-inch furnace filters today and learn why thousands of houses across North America trust United Filter.