Can I use a 4 furnace filter instead of 5?

Going down in thickness by an inch shouldn’t be a big deal – for example, you should be able to use a 4-inch filter instead of a 5-inch filter. … Higher MERV ratings work best when the filter is 4” thick or thicker because they trap extremely small particles, which means contaminants will build up quickly on the screen.

Can you use 4 one inch filters?

While a 4-inch-thick filter is more efficient than a 1-inch filter, the right size depends on your furnace. If you measure the filter slot, and it’s large enough to accommodate the thicker filter, then you can use it. However, if the slot is less than 4 inches wide, you’re stuck with using that thickness.

Can I use a different size furnace filter?

Most HVAC systems can only fit 1”-thick filters. If yours can accommodate a bigger one, opt for the thickest filter that comfortably fits and has been recommended by your HVAC professional. Thicker filters can handle more buildup, so you don’t have to replace them as often.

What happens if you put the wrong size filter in your furnace?

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.

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Can I use the wrong size 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.

Do I need a 5-inch furnace filter?

If your house is one that has a lot of dust, you’ll need to change one and two-inch filters out every month, four-inch filters every two months and five-inch filters every three months. If anyone in your home has allergies, they will benefit from more frequent air filter changes.

How often should you change 4-inch furnace filter?

In general, this is how often changing furnace filters needs to be done: For 1- to 2-inch filters, replace them every 1 to 3 months. For 3- to 4-inch filters, replace them every 6 to 9 months. For 5- to 6-inch filters, replace them every 9 to 12 months.

Can I use 2 filters in my furnace?

Bottom Line: Putting two filters will not make it last longer but may make you have to replace it earlier, assuming it doesn’t already reduce air flow too much with just the filters.

Can a furnace filter be too big?

A furnace filter that is either too small or too big for your furnace will allow air to pass by the filter. But too thick of a density will risk blockages to airflow and can greatly increase the necessary energy and the associated costs.

Should a furnace filter fit tight?

How tight should a Furnace Filter fit? … 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.

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