Top Common Furnace Filter Sizes: Find the Perfect Fit for Optimal Air Quality

There are many furnace filter sizes to choose from, depending on your home's household size and HVAC requirements.

Choosing the right furnace air filters will ensure good air quality and save you from pollutants such as dust.

The right furnace filter size will also increase the efficiency of your HVAC system, saving you some bucks.

Wondering how to choose the right furnace filter size for your home?

We have got you covered.

In our comprehensive guide, we'll explain how to choose the right furnace filter sizes and types for your North American home. 

We'll also discuss common furnace filter sizes and their best uses.

Additionally, we will highlight United Filter, a trusted name in Ontario that is known for manufacturing and distributing quality and efficient furnace filters in Canada and the USA.

We have common furnace filter sizes in stock, making it easier for you to choose the right one for your home or business and improving indoor air quality. 

Ready to transform your indoor environment with our efficient HVAC air filters?

Read on. 

Why Choosing the Right Furnace Filter Size Matters?

First thing first. 

What is a furnace filter, and what does it do?

A furnace air filter is a device that removes contaminants such as dust, pollen, and mould spores from the air passing through your HVAC system.

This will improve indoor air quality and protect the HVAC unit from dust buildup. 

Some AC air filters can be fitted with activated carbon layers to trap odour-causing particles such as volatile organic compounds. 

HVAC air filters are available in different sizes, such as 16x20x5, 20x25x5, and 14x25x5.

But what does each number represent?

For the case of 16x20x5 filter size:

• 16 is the width of the filter in inches
• 20 is the height of the filter in inches
• 5 is the depth or thickness of the filter, also in inches. 

With that said, here are the reasons why it's important to choose the right furnace filter size for your HVAC system:

1. Ensures Proper Airflow 

Using a too-large or too-small AC air filter can restrict or disrupt airflow.

And result?

Your HVAC unit will be forced to work extra hard, increasing energy use and bills. 

This additional strain can also shorten the lifespan of your HVAC system, affecting the return on investment ( RoI).

However, when you use the correct furnace air filter size, the air will flow smoothly without additional strain on the HVAC system,

Looking for the perfect furnace filter size for your home?

We have a wide selection of common furnace filter sizes.

Choose the right HVAC air filter depending on your desired MERV rating, health concerts, etc.

Make your order, and we'll ship it to you, whether you live in Canada or the USA.

Please note that we offer free shipping for homeowners living in Ontario and Quebec. 

2. Improves Air Quality 

Our air is filled with airborne particles like pet dander, pollen, dust, etc.

This can be an issue if there are allergy-prone individuals in your home. 

When you use the correct furnace filter size, there won't be any gaps around it, ensuring it traps all the airborne particles and improves indoor air quality. 

Go through our wide selection of common furnace filter sizes to choose the perfect fit for your HVAC homes. 

3. Reduce Energy Costs

When you install the right furnace filter size, your HVAC unit will work smoothly without straining to distribute air in your home.

And benefits?

It'll use less energy, lowering your utility bills as well as your environmental impact. 

You'll also avoid issues such as overheating or motor burnout, which result from overworking your HVAC system. 

Understanding Furnace Filter Types

You can get many types of HVAC air filters for your home in Canada or the USA.

Here are the popular types of furnace filters in Canada and the USA:

- HEPA Filters

High-efficiency particulate air ( HEPA) filters can trap up to 99.97 percent of airborne pollutants, including dust particles as small as 0.3 microns. 

HEPA filters provide the highest protection, making them ideal for people with allergies or other respiratory issues. 

One of the biggest advantages of HEPA filters is how effectively they trap pollutants, improving indoor air quality.

They are also cost-effective and only need to be changed every few years.

Drawback?

HEPA filters are helpless against very small particles such as fumes, gases or odours. 

Do you have any questions about HEPA filters?

Call us on (905) 403-0160 to engage with our knowledgeable team. 

- Washable Filters 

Buying washable filters is considered an eco-friendly way to save money.

As the name suggests, these filters can be washed and reused repeatedly instead of buying new ones. 

Although washable filters may have higher upfront costs, they will serve you for many years. 

However, they should be maintained properly to enhance their efficiency and lifespan.

First, ensure your washable filters are fully dry before returning them to your HVAC unit.

Any moisture can encourage mould growth, posing health concerns.

But why buy washable filters for your HVAC system?

The best thing about washable filters is that you only need to buy them once, and they can even last the lifespan of your HVAC unit. 

They have a higher RoI and can help reduce waste.

Despite this, washable filters need to be maintained regularly.

This means you must remove, wash and let them dry fully before reinserting them. 

Failure to do so will affect its effectiveness and may lead to mould growth, worsening the indoor air quality. 

- Fibreglass

Are you looking for affordable and disposable HVAC air filters?

Buy fibreglass filters from United Filter, a trusted supplier in Canada and the USA.

They are made from layered fibreglass material and can effectively capture larger particles like lint.

However, fibreglass filters can't trap tiny particles like pollen or pet dander, making them less effective for homes with allergy-prone individuals. 

Also, they need to be replaced more regularly- typically every 30 days. 

- Pleated Filters 

Pleated furnace air filters are made from dense materials like cotton, and hence, they have a large surface area to trap particles.

What about their benefits?

Pleated AC air filters are effective in trapping tiny particles like dust mites.

They also offer a balanced option for improving air quality without restricting airflow, making them ideal for homes with moderate air quality needs.

However, pleated air filters may cost more upfront than fibreglass ones. 

Nominal Vs. Actual Size: Understanding Furnace Filter Sizes

Knowing the difference between nominal and actual sizes is essential for ensuring a proper fit for your HVAC unit.

Nominal size is the standard filter size label, usually rounded to the nearest inch.

In other words, it doesn't reflect the precise furnace filter size.

On the other hand, the actual size is the correct dimension of your AC air filter and can vary slightly from the nominal size. 

For instance, a 5" filter may have a nominal size of 16x25x5. However, the actual size is 15-⅞  x 24-¾  x 4-⅜. 

For this reason, it's important to check these measurements to avoid getting an improper size, which can reduce HVAC's efficiency and performance. 

The challenge of determining the right furnace filter size is further complicated by the practices of many original equipment manufacturers (OEMs).

OEMS produces furnace air filters in varying sizes to encourage brand loyalty.

Due to compatibility issues, customers may feel compelled to purchase replacement filters from the same manufacturer.

Not us, though.

We only sell Canadian-made, affordable, correct-sized aftermarket filters.

Explore our broad selection of common furnace filter sizes and choose the perfect fit for your HVAC system. 

Make your order, and we'll deliver it right to your doorstep.

How Do I Know My Furnace Filter Size?

Here is a step-by-step guide on how to measure the size of your HVAC air filter:

- Gather the Necessary Tools

You'll need:

Tape measure

Notepad

Pen or pencil

- Remove the Current Filter 

Turn off your HVAC system and carefully remove the existing air filter.

- Check for Labelling 

Many filters are labelled with their nominal size, for instance, 16x25x5.

If it is there, write it down.

- Measure the Actual Size 

Using the tape, measure the three dimensions of the filter in inches: width, height, and thickness and record these measurements on your notepad. 

Are you wondering 'How to measure furnace filter size without a filter?'

If there's no filter, measure the slow where it typically sits.

Record the width, height and depth of the slot.

These measurements will help you find the right size for your HVAC air filter. 

- Cross-Reference with Common Furnace Filter Sizes 

Once you have your measurements, compare them with a list of common furnace filter sizes such as 6x20x5, 20x25x5, and 14x25x5. 

If the measurement falls between two sizes, choose the one that fits best to avoid issues with airflow. 

Understanding MERV Ratings for Furnace Filters

Minimum efficiency reporting value ( MERV) refers to the effectiveness of an air filter in trapping airborne particles. 

The higher the MERV rating, the better the filtration efficiency.

MERV 8 Filter 

A filter with MERV 8 can effectively trap large particles like pollen, which range in size between 3 and 10 microns. 

They offer the perfect balance between airflow and air quality, making them ideal for homes without pets or allergy-prone individuals. 

MERV 11 AC Air Filter 

MERV 11 filters can trap smaller particles (1-3 microns), including dust mites or pet dander. 

Do you have a pet or mild allergies?

Get a MERV 11 filter from us. It'll improve indoor air quality while maintaining a decent airflow.

MERV 13 Filters 

They are highly efficient in trapping tiny particles such as tobacco smoke. 

They are best suited for homes with high levels of pollutants.

Also, consider getting a MERV 13 filter from us if you have severe respiratory issues. 

Although higher-rated filters have better filtration, they can restrict airflow, forcing the HVAC to work extra hard.

Hence, when exploring our common furnace filter sizes, choose a compatible one. 

Common Furnace Filter Sizes

You might wonder, 'What is the standard filter size?'

There are many common furnace filter sizes, and there's no one-size-fits-all.

The size will depend on your air quality needs and HVAC compatibility. 

Here are some of the common furnace filter sizes and their ideal application:

- 16x25x1 Filter 

This can be used in a wide variety of homes.

It can effectively trap large particles like dust, making them ideal for families without severe respiratory issues. 

- 20x20x1 Filters

These are mostly used in large homes or businesses with higher airflow requirements.

These filters can trap common pollutants such as pet dander while ensuring your HVAC operates efficiently. 

- 16x25x4 Filters 

These filters are designed for HVAC units that require a thicker filter to capture tiny particles like mould spores.

Does your home have individuals suffering from allergies?

This furnace filter size is perfect for you to enjoy quality indoor air without compromising airflow. 

However, when browsing common furnace filter sizes, it's crucial to check the compatibility issues to ensure proper fit and optimal performance. 

Can I use a 1-inch furnace filter instead of a 4-inch? 

No, it's not recommended.

Generally, a 4-inch filter has better filtration and airflow and lasts longer than a 1-inch filter. 

Ensure you use the right filter size to avoid compromising your home's air quality and the performance of your HVAC unit. 

Where to Find The Perfect Furnace Filter Size 

United Filter is your one-stop manufacturer to get the right furnace filter size for your home in Canada and the USA. 

Our wide selection of common furnace filter sizes makes it easier for you to get the one that meets your needs. 

Whether you're looking for high-efficiency HEPA options, eco-friendly washable filters, or affordable fiberglass alternatives, we have everything you need.

Order from us today and we’ll ensure it gets to you on time and in perfect condition. 

Top Common Furnace Filter Sizes: Find the Perfect Fit for Optimal Air Quality

There are many furnace filter sizes to choose from, depending on your home's household size and HVAC requirements.

Choosing the right furnace air filters will ensure good air quality and save you from pollutants such as dust.

The right furnace filter size will also increase the efficiency of your HVAC system, saving you some bucks.

Wondering how to choose the right furnace filter size for your home?

We have got you covered.

In our comprehensive guide, we'll explain how to choose the right furnace filter sizes and types for your North American home. 

We'll also discuss common furnace filter sizes and their best uses.

Additionally, we will highlight United Filter, a trusted name in Ontario that is known for manufacturing and distributing quality and efficient furnace filters in Canada and the USA.

We have common furnace filter sizes in stock, making it easier for you to choose the right one for your home or business and improving indoor air quality. 

Ready to transform your indoor environment with our efficient HVAC air filters?

Read on. 

Why Choosing the Right Furnace Filter Size Matters?

First thing first. 

What is a furnace filter, and what does it do?

A furnace air filter is a device that removes contaminants such as dust, pollen, and mould spores from the air passing through your HVAC system.

This will improve indoor air quality and protect the HVAC unit from dust buildup. 

Some AC air filters can be fitted with activated carbon layers to trap odour-causing particles such as volatile organic compounds. 

HVAC air filters are available in different sizes, such as 16x20x5, 20x25x5, and 14x25x5.

But what does each number represent?

For the case of 16x20x5 filter size:

• 16 is the width of the filter in inches
• 20 is the height of the filter in inches
• 5 is the depth or thickness of the filter, also in inches. 

With that said, here are the reasons why it's important to choose the right furnace filter size for your HVAC system:

1. Ensures Proper Airflow 

Using a too-large or too-small AC air filter can restrict or disrupt airflow.

And result?

Your HVAC unit will be forced to work extra hard, increasing energy use and bills. 

This additional strain can also shorten the lifespan of your HVAC system, affecting the return on investment ( RoI).

However, when you use the correct furnace air filter size, the air will flow smoothly without additional strain on the HVAC system,

Looking for the perfect furnace filter size for your home?

We have a wide selection of common furnace filter sizes.

Choose the right HVAC air filter depending on your desired MERV rating, health concerts, etc.

Make your order, and we'll ship it to you, whether you live in Canada or the USA.

Please note that we offer free shipping for homeowners living in Ontario and Quebec. 

2. Improves Air Quality 

Our air is filled with airborne particles like pet dander, pollen, dust, etc.

This can be an issue if there are allergy-prone individuals in your home. 

When you use the correct furnace filter size, there won't be any gaps around it, ensuring it traps all the airborne particles and improves indoor air quality. 

Go through our wide selection of common furnace filter sizes to choose the perfect fit for your HVAC homes. 

3. Reduce Energy Costs

When you install the right furnace filter size, your HVAC unit will work smoothly without straining to distribute air in your home.

And benefits?

It'll use less energy, lowering your utility bills as well as your environmental impact. 

You'll also avoid issues such as overheating or motor burnout, which result from overworking your HVAC system. 

Understanding Furnace Filter Types

You can get many types of HVAC air filters for your home in Canada or the USA.

Here are the popular types of furnace filters in Canada and the USA:

- HEPA Filters

High-efficiency particulate air ( HEPA) filters can trap up to 99.97 percent of airborne pollutants, including dust particles as small as 0.3 microns. 

HEPA filters provide the highest protection, making them ideal for people with allergies or other respiratory issues. 

One of the biggest advantages of HEPA filters is how effectively they trap pollutants, improving indoor air quality.

They are also cost-effective and only need to be changed every few years.

Drawback?

HEPA filters are helpless against very small particles such as fumes, gases or odours. 

Do you have any questions about HEPA filters?

Call us on (905) 403-0160 to engage with our knowledgeable team. 

- Washable Filters 

Buying washable filters is considered an eco-friendly way to save money.

As the name suggests, these filters can be washed and reused repeatedly instead of buying new ones. 

Although washable filters may have higher upfront costs, they will serve you for many years. 

However, they should be maintained properly to enhance their efficiency and lifespan.

First, ensure your washable filters are fully dry before returning them to your HVAC unit.

Any moisture can encourage mould growth, posing health concerns.

But why buy washable filters for your HVAC system?

The best thing about washable filters is that you only need to buy them once, and they can even last the lifespan of your HVAC unit. 

They have a higher RoI and can help reduce waste.

Despite this, washable filters need to be maintained regularly.

This means you must remove, wash and let them dry fully before reinserting them. 

Failure to do so will affect its effectiveness and may lead to mould growth, worsening the indoor air quality. 

- Fibreglass

Are you looking for affordable and disposable HVAC air filters?

Buy fibreglass filters from United Filter, a trusted supplier in Canada and the USA.

They are made from layered fibreglass material and can effectively capture larger particles like lint.

However, fibreglass filters can't trap tiny particles like pollen or pet dander, making them less effective for homes with allergy-prone individuals. 

Also, they need to be replaced more regularly- typically every 30 days. 

- Pleated Filters 

Pleated furnace air filters are made from dense materials like cotton, and hence, they have a large surface area to trap particles.

What about their benefits?

Pleated AC air filters are effective in trapping tiny particles like dust mites.

They also offer a balanced option for improving air quality without restricting airflow, making them ideal for homes with moderate air quality needs.

However, pleated air filters may cost more upfront than fibreglass ones. 

Nominal Vs. Actual Size: Understanding Furnace Filter Sizes

Knowing the difference between nominal and actual sizes is essential for ensuring a proper fit for your HVAC unit.

Nominal size is the standard filter size label, usually rounded to the nearest inch.

In other words, it doesn't reflect the precise furnace filter size.

On the other hand, the actual size is the correct dimension of your AC air filter and can vary slightly from the nominal size. 

For instance, a 5" filter may have a nominal size of 16x25x5. However, the actual size is 15-⅞  x 24-¾  x 4-⅜. 

For this reason, it's important to check these measurements to avoid getting an improper size, which can reduce HVAC's efficiency and performance. 

The challenge of determining the right furnace filter size is further complicated by the practices of many original equipment manufacturers (OEMs).

OEMS produces furnace air filters in varying sizes to encourage brand loyalty.

Due to compatibility issues, customers may feel compelled to purchase replacement filters from the same manufacturer.

Not us, though.

We only sell Canadian-made, affordable, correct-sized aftermarket filters.

Explore our broad selection of common furnace filter sizes and choose the perfect fit for your HVAC system. 

Make your order, and we'll deliver it right to your doorstep.

How Do I Know My Furnace Filter Size?

Here is a step-by-step guide on how to measure the size of your HVAC air filter:

- Gather the Necessary Tools

You'll need:

Tape measure

Notepad

Pen or pencil

- Remove the Current Filter 

Turn off your HVAC system and carefully remove the existing air filter.

- Check for Labelling 

Many filters are labelled with their nominal size, for instance, 16x25x5.

If it is there, write it down.

- Measure the Actual Size 

Using the tape, measure the three dimensions of the filter in inches: width, height, and thickness and record these measurements on your notepad. 

Are you wondering 'How to measure furnace filter size without a filter?'

If there's no filter, measure the slow where it typically sits.

Record the width, height and depth of the slot.

These measurements will help you find the right size for your HVAC air filter. 

- Cross-Reference with Common Furnace Filter Sizes 

Once you have your measurements, compare them with a list of common furnace filter sizes such as 6x20x5, 20x25x5, and 14x25x5. 

If the measurement falls between two sizes, choose the one that fits best to avoid issues with airflow. 

Understanding MERV Ratings for Furnace Filters

Minimum efficiency reporting value ( MERV) refers to the effectiveness of an air filter in trapping airborne particles. 

The higher the MERV rating, the better the filtration efficiency.

MERV 8 Filter 

A filter with MERV 8 can effectively trap large particles like pollen, which range in size between 3 and 10 microns. 

They offer the perfect balance between airflow and air quality, making them ideal for homes without pets or allergy-prone individuals. 

MERV 11 AC Air Filter 

MERV 11 filters can trap smaller particles (1-3 microns), including dust mites or pet dander. 

Do you have a pet or mild allergies?

Get a MERV 11 filter from us. It'll improve indoor air quality while maintaining a decent airflow.

MERV 13 Filters 

They are highly efficient in trapping tiny particles such as tobacco smoke. 

They are best suited for homes with high levels of pollutants.

Also, consider getting a MERV 13 filter from us if you have severe respiratory issues. 

Although higher-rated filters have better filtration, they can restrict airflow, forcing the HVAC to work extra hard.

Hence, when exploring our common furnace filter sizes, choose a compatible one. 

Common Furnace Filter Sizes

You might wonder, 'What is the standard filter size?'

There are many common furnace filter sizes, and there's no one-size-fits-all.

The size will depend on your air quality needs and HVAC compatibility. 

Here are some of the common furnace filter sizes and their ideal application:

- 16x25x1 Filter 

This can be used in a wide variety of homes.

It can effectively trap large particles like dust, making them ideal for families without severe respiratory issues. 

- 20x20x1 Filters

These are mostly used in large homes or businesses with higher airflow requirements.

These filters can trap common pollutants such as pet dander while ensuring your HVAC operates efficiently. 

- 16x25x4 Filters 

These filters are designed for HVAC units that require a thicker filter to capture tiny particles like mould spores.

Does your home have individuals suffering from allergies?

This furnace filter size is perfect for you to enjoy quality indoor air without compromising airflow. 

However, when browsing common furnace filter sizes, it's crucial to check the compatibility issues to ensure proper fit and optimal performance. 

Can I use a 1-inch furnace filter instead of a 4-inch? 

No, it's not recommended.

Generally, a 4-inch filter has better filtration and airflow and lasts longer than a 1-inch filter. 

Ensure you use the right filter size to avoid compromising your home's air quality and the performance of your HVAC unit. 

Where to Find The Perfect Furnace Filter Size 

United Filter is your one-stop manufacturer to get the right furnace filter size for your home in Canada and the USA. 

Our wide selection of common furnace filter sizes makes it easier for you to get the one that meets your needs. 

Whether you're looking for high-efficiency HEPA options, eco-friendly washable filters, or affordable fiberglass alternatives, we have everything you need.

Order from us today and we’ll ensure it gets to you on time and in perfect condition.