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Velvet Digest

Can you cut air filters to fit?

Author

Christopher Snyder

Updated on June 16, 2026

Should you cut HVAC air filters to fit thespace? The answer - NO! The purpose of the HVAC air filteris to keep the system clean. Yes, the TV commercials say that ifyou use this or that filter the air in the housewill be cleaner and your children will behealthier.

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Also know, what happens if you use the wrong size air filter?

Dirty or Wrong Size Air Filter - As the ACfilter clogs with dirt and debris, the efficiency of thesystem plummets, causing you to pay extra money for lesscooling power. In addition, the air conditioner blower hasto work even harder than normal, which can lead to internaldamage.

do more expensive air filters work better? If it fits, it's fine. Air filters removedifferent sizes of particulates from the air before theair flows through the blower and into the rest of your home.Longer run times use more energy, cost youmore money, and even worse — reduce the blower motor'slifespan eventually leaving you an expensive repairbill.

Similarly, you may ask, can you cut air filter?

Use scissors and cut our new air filterfrom your Natural Aire 'Cut to Fit' Air Filter. Tip:Using the 'Cut to Fit' air filters is about ½of the price as pre-cut filters and cutting them tosize only take about 5 minutes.

Do pleated air filters restrict airflow?

Because they restrict airflow to your HVACsystem. Pleated, high-MERV filters definitely capturea lot of pollutants, but they also restrict the movement ofair into your blower or furnace. As a result, the fan has towork harder to heat and cool your home, reducingefficiency.

Related Question Answers

What is the most common air filter size?

The most common furnace filter sizes are10 X 20, 14 X 20, 16 X 24, 18 X 30, 12 X 12, 14 X 24, 16 X 25, 20 X20, 12 X 20, 14 X 25, 18 X 18, 20 X 24, 12 X 24, 14 X 30, 18 X 20,20 X 25, 12 X 30, 15 X 20, 18 X 24, 20 X 30, 12 X 36, 16 X 20, 18 X25, 4 X 24, and 25 X 25, and these sizes range in depth from1 to 6 inches.

What happens if I put my furnace filter in backwards?

The most common problem you will face with abackwards facing filter is simple inefficiency.If your furnace is forced to blow air throughthe non-porous end of a filter, it will take moreenergy to do so. The blower will be overworked andyou will pay more money for your heating.

Is a thicker air filter better?

Most air filters are 1 inch thick, butsome systems can accommodate filters 2 to 5 inchesthick. In our tests, we found that the thicker thefilter, the better it works and the longer thereplacement intervals. That means it's better for you andfor your HVAC system.

Does higher MERV rating restrict airflow?

High MERV ratings can restrictairflow. For the most part, filters are able to get high MERVratings by using denser material. However, a denser filter canmake it harder for your furnace to push air through, which candecrease your system's efficiency.

How do you determine furnace filter size?

Furnace filters are sized by width,length and thickness. The size on the filteris usually expressed in inches (example: 16"x20"x1"). Afilter that is the wrong size will typically not fit,or may not stay in place, once installed. The owner's manualfor your furnace should tell you what size youneed.

Does arrow on air filter go up or down?

It means the arrow faces the unit, or in otherwords, facing inside the space you're putting it into. Assumingyour unit is outside or in your attic, you want the arrow toface the unit. Let's make this simpler though. Make thearrows face the ceiling or wall.

What size air filter should I buy?

Follow these 3 easy steps:
  1. Follow these 3 easy steps:
  2. Step 1 - Measuring Length and Width (L x W).
  3. Step 2 - Measure the thickness of your filter from front toback.
  4. Step 3 - Put Your Measurements Together (L x W x D).
  5. It's as simple as that - You are now ready to buy the rightfilter for your AC or Furnace.

Can I use a 1 inch filter instead of 4?

While a 4-inch-thick filter is moreefficient than a 1-inch filter, the right sizedepends on your furnace. If you measure the filter slot, andit's large enough to accommodate the thicker filter, thenyou can use it. However, if the slot is less than 4inches wide, you're stuck with using thatthickness.

How do you measure filter size?

Take out your measuring tape and get the exactdimensions yourself. These are written as length x width xdepth (for example: 18x20x1). Lay the filter flat on theground and start by measuring top-to-bottom for length,left-to-right for width, and front-to-back for depth. You shouldhave 3 numbers written in inches.

Is MERV 8 good enough?

MERV 5–8 (good): Thesefilters are better at catching small particles (3–10 microns)like mold spores, hair spray, dust mites and animal dander.MERV 9–12 (better): The best option for residentialuse.

Does it matter what air filter you use for your car?

Purchasing a premium air filter foryour car will provide optimal air flow, maximumengine performance and the best fuel efficiency. Theability of your air filter to remove harmful dirt, debrisand foreign matter from your engine's airintake is directly attributed to the long life ofyour engine.

Is an electronic air cleaner worth it?

Is an Electronic Air Cleaner Worth It? Whenspringtime hits, your indoor air quality can actually beworse than that of outdoors. In fact, that filter is meantto protect the inside components of your system, not your indoorair. That's not to say that it has no effect on your indoorair.

Are pleated filters better than fiberglass?

Pleated filters are also better for anyonewho wants more longevity from their filter since they do nothave to be changed as often as fiberglass filters. This alsomakes pleated air filters more cost effective in the longrun.

Are K&N air filters worth it?

Considering the boost in fuel economy and power from aK&N engine air filter, millions of customersbelieve they're worth the extra cost. Millions more reportan improvement in heating and AC performance with a K&Ncabin air filter, so you can draw your ownconclusions.

Do high performance air filters make difference?

One of the benefits of a high flow air filter isthat, unlike regular filters, you don't have to change itevery year. In fact, a high flow air filter can actuallyincrease your horsepower by about 3 to 5 HP and increase yourtorque as well. At the same time, this can lead to increasedfuel efficiency.

How long do Filtrete filters last?

three months

Do better furnace filters make a difference?

The answer is that you're getting a filter thatrequires less changing and captures more, and smaller, particles.The cheap woven fiberglass filters do one thing—screenout dirt and debris that could damage your furnace blowermotor, though they do take out some pollen and moldspores.

Do higher MERV filters restrict airflow?

Here's the problem: Some filters with a highMERV rating can drop air pressure in your duct system, whichcan increase energy bills and damage your HVAC system. Because thefilter is thin and the MERV is high, itreduces airflow into the duct system. And like we saidbefore: low airflow = wasting energy.

Is MERV 11 too restrictive?

MERV 11 are approximately the same. A MERV11 would be considered an “allergy” filter thatdoes a good job of removing particles in all size ranges. Most ofthe thicker filters are sold as a MERV 11 or higher, butthey are also available in a MERV 7 or MERV8.