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Five Inch Air Filters

5” pleated air filters manufactured by FilterBuy are a guaranteed fit for your AC or Furnace. Don't see your size listed below? Simply create it via our custom filter tool.

Five Inch Air Filters

5" Filters

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Need a Perfect Fit? Five Inch HVAC and Furnace Air Filter Replacements Made in the USA


Slide open the cabinet on your furnace return and you will find a filter several inches deep, pleated like an accordion and tucked where almost nobody looks. That deep filter does the quiet work in your home. It catches the dust, pollen, and pet dander moving through your air before your family breathes any of it in, and it shields the HVAC system you count on every day. We are obsessed with that hidden job. At Filterbuy, we build five inch HVAC and furnace air filter replacements in our own U.S. facilities, cut to the exact size and MERV rating your system was made for, so you get a perfect fit the first time.


TL;DR Quick Answers


Five Inch HVAC And Furnace Air Filter Replacements


A five inch HVAC or furnace air filter is a deep, pleated media filter (actual depth about 4-3/8 inches) that drops into a dedicated cabinet on your system's return. The extra pleated surface area lets it run six to twelve months and reach a higher MERV without choking airflow, so you replace it far less often than a one inch filter. Filterbuy builds exact-fit and custom five inch replacements, American-made and shipped to your door.



Top Takeaways



What A Five Inch Air Filter Actually Does


A five inch air filter is a deep, pleated media filter that drops into a dedicated cabinet on the return side of your furnace or air handler, where it cleans your air before that air loops back through the house. Any air filter traps particles as air pushes through the media. Depth is what makes the five inch version special. All those extra pleats pack in far more surface area than a one inch filter, and that single difference is why it works so well and treats your system so gently.


Why Depth Beats A One Inch Filter


More surface area lets air move through slowly, with less push-back against your blower. That lower resistance is what lets a five inch filter reach a higher MERV without starving your system for airflow. The extra media holds more dust, too, so the filter keeps working for months instead of weeks. We have watched this play out in real homes for years. A filter that loads up slowly is one you replace less often, and a system that breathes easily is one that lasts.


Common Five Inch Filter Sizes And Cabinet Fitment


Five inch filters come in the sizes that match the most common whole-house cabinets, including 16x25x5, 20x25x5, 20x20x5, and 16x20x5. Those numbers are nominal, rounded for easy shopping. The filter itself runs a little under five inches deep, right around four and three-eighths inches, so it seats snugly in its housing. We make replacements that fit the major brand cabinets already in your home, including Honeywell, Carrier, Trane, and Aprilaire. If you run a Lennox system, our Lennox 20x25x5 replacement filters slide straight into the Healthy Climate cabinet. Since these filters live inside the furnace return, plenty of people search for furnace five inch air filters by brand and size, and we keep those matches in stock.


Picking The Right MERV Rating


MERV is the scale the industry uses to rate how well a filter captures particles, and five inch media covers the most useful stretch of it, usually MERV 8, 11, 13, and 16. A MERV 8 keeps your equipment clean and catches the bigger stuff like lint and dust. Step up to MERV 11, and you start pulling more pollen and pet dander out of the air. MERV 13 is where a lot of families land when someone in the house deals with allergies or asthma, because it grabs finer particles while the deep design keeps your airflow healthy. If you are not sure which way to go, match the rating to your household and check that your system can handle it before you reach for the top.


How Often To Replace A Five Inch Filter


Here is the part homeowners like most. A one inch filter usually needs swapping every one to three months. A five inch filter often runs six to twelve months before it needs attention, depending on your home. Pets, dust, allergies, and a system that runs hard will all shorten that stretch, so glance at the filter a few times a year and swap it when the media looks loaded. Set a reminder on your phone and you can mostly forget about it in between.


Five Inch Filters Nearby, Without The Drive


If you have searched for five inch air filters nearby and struck out at the hardware store, you are in good company. Deep filters and odd sizes rarely make it onto local shelves. Instead of driving across town and guessing at the size, order the exact filter and MERV from Filterbuy and let it land on your doorstep. When your cabinet needs a size the big-box stores skip, we build it custom in our U.S. facilities and ship it to you.


“After manufacturing filters for over a decade and serving more than two million households, I have noticed a pattern. The people who move up to a quality five inch filter rarely call because something broke. They call because they forgot how easy clean air could be. A deeper filter does more work, lasts longer, and asks less of your system. That is the kind of honest, low-effort upgrade we want in every home we serve.”

— Filterbuy Indoor Air Quality Team


Seven Essential Resources We Trust


We would rather point you to the people who set the standards than ask you to take our word for it. Start here.



Three Numbers That Make The Case


Most American homes run on central, forced-air systems, and every one of them depends on a filter. The numbers back that up.



Our Honest Take


Here is the advice we give our own families. If your system came with a five inch cabinet, use it. A deep filter is one of the few upgrades that costs little, takes about ten minutes, and quietly pays you back every day in cleaner air and fewer service calls. We build ours in the United States because we want to stand behind what is in the box. And we would rather win your trust with a filter that does its job without fuss than with a pushy pitch. Clean air should feel easy. The right five inch filter makes it that way.


Three Steps To Your Perfect Fit


  1. Find your size. Pull the current filter and read the nominal size stamped on the frame, like 20x25x5.

  2. Pick your MERV. Match it to your household, and lean toward MERV 13 if pets, allergies, or asthma are part of daily life.

  3. Order it and set a reminder. Have the exact filter shipped to your door, then mark your calendar six to twelve months out.


Frequently Asked Questions


Q: What Is A Five Inch Air Filter?


It is a deep, pleated media filter that fits a dedicated cabinet on the return side of a furnace or air handler. The extra depth gives it far more surface area than a one inch filter, so it catches more and lasts longer.


Q: What Sizes Do Five Inch Air Filters Come In?


The common ones are 16x25x5, 20x25x5, 20x20x5, and 16x20x5. Those match the popular cabinets from Lennox, Honeywell, Carrier, Trane, and Aprilaire. When your cabinet needs something unusual, we cut it custom.


Q: How Often Should I Replace A Five Inch Air Filter?


Most go six to twelve months, far longer than the one to three months a thin filter asks for. Pets, allergies, and heavy runtime shorten that, so check it a few times a year and swap it when it looks loaded.


Q: Are Five Inch Filters Better Than One Inch Filters?


For a system built to take one, yes. The depth lowers airflow resistance, supports a higher MERV without straining the blower, holds more dust, and stretches the time between changes. Just confirm you have a five inch cabinet first.


Q: What MERV Rating Should I Choose For A Five Inch Filter?


MERV 8 keeps equipment clean and catches larger debris. MERV 11 handles everyday pollen and pet dander. MERV 13 pulls finer particles for homes with allergies or asthma, and the deep design keeps airflow healthy even at that level.


Q: Do You Make Five Inch Filters In Custom Sizes?


We do. When your cabinet calls for a size the big-box stores skip, we build a custom five inch filter and ship it to your door.


Q: Where Can I Find Five Inch Air Filters Nearby?


Deep filters are hard to track down locally. Rather than searching store to store for five inch air filters nearby, order the exact size and MERV from Filterbuy and have it delivered.


Find Your Perfect Fit Today


Cleaner air does not have to be a hassle. Find your exact five inch size and MERV rating at Filterbuy.com, and we will ship American-made replacements straight to your door. Your family, your home, and your HVAC system will thank you for it.