Is it OK to cut a furnace filter to fit?

Some manufacturers can even customize the filters for you to fit perfectly when you or your HVAC team puts everything together. 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.

Do furnace filters have to fit exactly?

The filter must fit snuggly in your furnace.It is important to note that you must have an exact fit for your cabinet -“close enough is not good enough” in these circumstances. A good fit prevents air from slipping around the edges of the filter.

Does an air filter have to fit perfectly?

The air filter is your shield against air pollutants. When it is incorrectly sized, various air contaminants may enter your vents at least resistance. … 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.

Is it bad to cut an air filter?

Bending or cutting the filter also decreases its structural integrity. The whole filter can collapse while installed, creating not just a performance issue and a potentially costly repair, but also possibly creating unsafe conditions.

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What happens if your furnace filter is too big?

The biggest concern when you use the wrong size air filter is that it may not effectively prevent dust from building up on your HVAC system’s motors and blowers. This dirties up your furnace which could affect its performance or possibly harm the system’s internal components, leading to costly repairs or replacements.

What happens if your furnace filter is too small?

If the filter is too small, it won’t cover the entire space and may allow dust and dirt to flow past. If you’re not sure what size filter you need, check the manufacturer’s specifications or ask your HVAC technician for help choosing the right product.

What happens if you use a smaller furnace filter?

The filter can be sucked into the ventilation if it is much smaller than it should be. … The filter will be unable to protect your AC/HVAC unit and the unfiltered air will collect on internal components of your system, such as the coil and fan, which can lead to expensive repairs.

Do air filters have to be exact size?

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.

How tight should a furnace 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.

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How do I make my air filter fit?

A better solution would be to use a cut to fit the air filter instead. Just open up your window AC’s return grille on the front, and measure the filter slot to find the filter’s dimensions. After you get the length and width of the AC’s filter slot, cut out a piece of filter media and place it in the slot.

Can I use a 4 inch 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 cut a MERV 13 filter?

Merv 13 is designed to trap microscopic particles down to 0.3 microns. … If you are looking to create your own air filter projects, you can sandwich the Merv 13 material in between your regular cloth layers to create additional air filtration protection. The material can be cut to your desired shape and length.