Can I use a thinner filter in my 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.

Does thickness of furnace filter matter?

The Thicker, the Better

Furnace filters can range anywhere from 1″to 5″ in thickness. In general, the thicker the furnace filter is the more efficiently your unit work and the longer it will last.

Are thinner furnace filters better?

Some AC specialists have also noted that thicker filters are better at providing a tight fit that doesn’t allow unfiltered air through. At the same time, a thicker filter is less restrictive and will allow for better flow of purified air.

Can I use a different size filter in my furnace?

The actual size is what you’d find if you used a ruler to measure the exact dimensions of the filter. Actual sizes vary slightly depending on the brand, but in most cases, any standard size will work in a standard residential unit.

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 a 2 inch filter instead of 1 inch?

As you can see the 2 inch filter will serve our needs MUCH better than the 1 inch filter. Even if the duct system is in good shape, using this filter will keep the system from struggling.

How many filters should a furnace have?

Most furnaces will have a V shape filter system; the system will take 2 filters. The filters go up into the plenum in a V shape. Make sure that when you re-install the top door, it goes over the furnace frame so it engages the safety switch. If not the furnace will not run.