Quick Answer: Can an air filter be too big?

If you purchase a filter that’s too large, it won’t slide into the slot correctly. If the filter is too small, it won’t cover the entire space and may allow dust and dirt to flow past.

What happens if you use the wrong size air filter?

When you use the wrong size air filter, or you install it incorrectly, the filter can’t effectively prevent dust from accumulating on the system’s motors and blowers. You’ll end up with a dirty furnace that can’t properly perform, and all of that debris could end up harming the system’s internal components.

Does an air filter have to fit perfectly?

Your air filter should neither be small or big for your system. It should be the perfect fit to prevent the possibilities of indoor air illnesses.

Do air filter sizes have to be exact?

Since air filters are most often sold by their nominal dimensions, it is crucial to learn how to properly measure your air filter. When making your purchase, you should order your filter by its nominal size, rather than its actual size.

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Is it OK to use a smaller air filter?

An improperly sized air filter doesn’t do its job. When it’s too small, it lets dust, mold, and other contaminants into your air vents. These then spew into your air, providing air quality problems.

How tight should an air filter fit?

How tight should a Furnace Filter fit? When you remove the existing filter, take note of the dimensions printed on its frame. Your new filter will need to match this size for the system to run efficiently. It should fit snugly but not so tight that you can’t easily slide the filter in and out.

Do Furnace filters have to be exact size?

Your filter or HVAC unit should have both the nominal and the actual size written on it. If you can’t find the actual size, it’s a good idea to measure it just in case. Our website categorizes filters by the nominal size, making it easier to navigate and find your filter.

Can I use a 4 inch filter instead of 1?

The 4-inch thick air filter has a definite advantage over the 1” filter in terms of longevity, airflow and maximum filtering potential. Thus, if it fits your furnace, then a 4-inch air filter is better than a 1-inch air filter in regards to improving air quality.

What size air filters do apartments use?

If you’re looking for a reliable quality air filter, and you have no special circumstances, then we recommend starting with the MERV 8, or even a MERV 11. However, if you have a newborn baby or allergies, then we recommend at least a MERV 11, or maybe a MERV 13, depending on your needs.

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How do I know what size air filter to buy?

Follow these 3 easy steps to measure your HVAC filter size:

  1. Step 1 – Measuring Length and Width (L x W). (If your filter is not a square, the smallest measurement goes first).
  2. Step 2 – Measure the thickness (Depth) of your filter from front to back.
  3. Step 3 – Put Your measurements together (L x W x D).

How do I know what size air filter for my house?

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 to back.
  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 right filter for your AC or Furnace.

What do air filter sizes mean?

All filters are sized two different ways. … The actual size is the exact dimensions with no rounding; whereas, the nominal size is the rounded dimensions of the filter. This means that on 1″ and 2″ air filters, the nominal size does not include the undercut, and the actual size does include the undercut.

Can I cut air filter to size?

Answering the Question: Is it okay to cut an air filter to fit? … Simply put, yes, you can cut an air filter if you know what you are doing, and if the filters you use will not become too weak from the cutting.

Is a 2 inch filter better than a 1 inch?

Most air filters are 1 inch thick, but some systems can accommodate filters 2 to 5 inches thick. In our tests, we found that the thicker the filter, the better it works and the longer the replacement intervals. That means it’s better for you and for your heating, ventilating, and air conditioning (HVAC) system.

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