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Holiday Flash Sale

Flash coupon! Click below to take up to 35% OFF your first order of furnace filters*

*Sale ends 12/25 at midnight. Get 25% off single purchases and 35% off subscriptions (first shipment)

Flash coupon! Click below to take up to 35% OFF your first order of furnace filters*

Get 25% off single purchases and 35% off subscriptions (first shipment). Sale ends 12/25 at midnight.

How it Works

Choose

Choose

Select the quantity and sizes of the filters you need.

Schedule

Schedule

Pick how often you’d like filters delivered. Shipping is free.

Replace

Swap out your old filters with new ones when they’re delivered.

How it Works

How it Works

Shop Air Filters

Select your filter size

Select filter quality

MERV 8

“Dust Bunny Blocker”
Dust
Pollen
Mold
Mites
Bacteria

MERV 11

“Pet Dander Dodger”
Dust
Pollen
Mold
Mites
Bacteria
Pet Dander

MERV 13

“Covid Buster”
Dust
Pollen
Mold
Mites
Bacteria
Pet Dander
Cooking Oil
Viruses
Smoke
Smog

FST Delivers Air Filters Right to Your Door

FST Filter Subscription

If you’re looking for the highest quality replacement furnace filters for your home, we’ve got you covered! Shop the biggest selection of discount furnace filters online to get new replacement filters for your furnace delivered to your home when you need them. We’ve got the lowest prices on American made filters, with free shipping and easy returns.

We know how busy you are so we’ve made it easy to find and order your filters in 5 minutes or less. If you want to save even more time, start a subscription and never have to worry about ordering filters again. We’ll deliver new filters on a regular schedule that you determine.

When should I change my furnace filter?

Furance air filters should be replaced every 60-90 days, or more often if you suffer from allergies or if you have children or pets.

FST Air Filters are made in the USA using high quality materials, and are long lasting so you can breathe better. All filters are pleated to provide more surface area to trap particles, and the frames stay rigid through temperature and humidity changes.

Replacing your furnace filter is an easy, inexpensive step to improve your indoor air quality and extend the life of your heating or cooling system.

What is the best MERV rating for furnace filters?

MERV 13

Wondering which furnace filter is right for you? One thing to consider is the filter’s MERV rating, which stands for  “Minimum Efficiency Reporting Value”. The most common MERV ratings are 8, 11 and 13. Most furnace filters are rated on a scale of 1 to 20, with the higher the number, the better. The rating indicates how well an air filter can capture particles of various sizes.

Generally speaking, the higher the MERV rating, the more effective that furnace filters is in improving your home’s indoor air quality. If your family has asthma, allergies, or certain other health issues, then you should probably be looking for a filter that’s rated MERV 11 or higher.

General FAQs

A: FST Filtration (fstfiltration.com) is a fast and simple way to order air filters. Just select the size and type of filter you need, and then choose how often you want them delivered to your home. We’ll ship the filters direct to your door, exactly when they need to be replaced. Air filters from FST are a similar or better quality than what you’d find at the big box stores, often at a fraction of the price.

Just visit fstfiltration.com and click “Find Your Filter”.

From there, select your filter size, your desired filter quality, and then choose whether you want to purchase one, or sign up for a subscription.

A: A good rule of thumb is you should change your furnace filter every 60 days. If you have someone in the home with allergies or asthma, have pets, or live in a dusty environment, you may need to change your HVAC filter more often. Also factors like how much you’re using your heating or cooling system, the size of your home and your indoor air quality can determine how often your air filters should be changed.

A: HVAC filters, including furnace and AC filters, cost different amounts depending on the MERV rating and thickness of the filter itself. A thicker air filter has a higher cost, but delivers a better value since you don’t need to change it as often.

A: FSTFiltration.com has a wide variety of replacement furnace air filter sizes, so the right size for you depends on your specific HVAC system.

Take a look at the existing filter inside your system to see what the dimensions are (they’re usually printed on the side of the filter). You can also determine the right size of air filter for your system by looking in your HVAC system’s owners manual.

If you need to measure your existing air filter:

  1. Measure the length (L) and the width (W).
  2. Measure the depth (D).
  3. Now combine these measurements as L x W x D.

Keep in mind that the filter’s true dimensions will be different than the manufacturer’s rounded numbers, which are called “nominal size”. For example, a filter may measure 19.5” x 19.5” x 2.5”, but be rounded by the manufacturer to 20” x 20” x 3”.

Shipping & Orders FAQs

A: Furnace air filters are shipped fast and free, via USPS Priority delivery.

A: We ship from Utah. Depending on your location, your filter should arrive within 2-8 days.

A: Just give us a call at 435-637-3567 and we’ll help find a solution for you.

A: We’ll make it right! Give us a call at 435-637-3567.

A: We don’t accept returns, but we want to make sure that you’re happy. Give us a call at 435-637-3567 with any concerns or questions.

A: Did you receive a 5 inch air filter, but ordered a 4” inch filter? Don’t worry! You probably received an air filter with the “nominal size” label, which is different from the actual size.

Our manufacturer rounds up the last number (thickness). So when you order a 20x25x4 filter for example, what you will receive may actually measure 19-7/8″ x 24-7/8″ x 4-3/8″, but is labeled 20x25x5.

Try installing the filter you receive, but if for some reason it doesn’t fit, no worries! Just call 435-637-3567 and we’ll help you out.

Subscription FAQs

A: Sure! If you have more than one property or home, you can create a subscription for each one. Just log into your account, click on “Subscriptions”, and start a new subscription with your same account.

A: Yes! If you need to change the delivery frequency on your subscription, email us at customerservice@fstsystems.com or call us at 435-637-3567 and we’ll take care of it for you.

A: Absolutely! Just email us at customerservice@fstsystems.com or call us at 435-637-3567 and we’ll take care of it for you.

Reviews

“I needed a custom size filter that I could not find ANYWHERE!! I checked all the websites and the size I needed was very expensive. FST Filtration gave me two filters at a very low costs and was shipped the next day! The quality of the filter was great and it was a perfect fit. FST has a new life time customer!”

Alyssa D.

“I was amazed with how fast my filters were shipped. With shipping always free I thought I was going to wait awhile for them to arrive. I ordered them on a Thursday night and they were shipped that next day and received them the following week.”

Shea T.

“I subscribed to their auto subscription and they ship it right to my doorstep when its time to be changed. Highly recommended to anyone that forgets to change out their furnace filter.”

Marcey W.

General FAQs

A: FST Filtration (fstfiltration.com) is a fast and simple way to order air filters. Just select the size and type of filter you need, and then choose how often you want them delivered to your home. We’ll ship the filters direct to your door, exactly when they need to be replaced. Air filters from FST are a similar or better quality than what you’d find at the big box stores, often at a fraction of the price.

Just visit fstfiltration.com and click “Find Your Filter”.

From there, select your filter size, your desired filter quality, and then choose whether you want to purchase one, or sign up for a subscription.

A: A good rule of thumb is you should change your furnace filter every 60 days. If you have someone in the home with allergies or asthma, have pets, or live in a dusty environment, you may need to change your HVAC filter more often. Also factors like how much you’re using your heating or cooling system, the size of your home and your indoor air quality can determine how often your air filters should be changed.

A: HVAC filters, including furnace and AC filters, cost different amounts depending on the MERV rating and thickness of the filter itself. A thicker air filter has a higher cost, but delivers a better value since you don’t need to change it as often.

A: FSTFiltration.com has a wide variety of replacement furnace air filter sizes, so the right size for you depends on your specific HVAC system.

Take a look at the existing filter inside your system to see what the dimensions are (they’re usually printed on the side of the filter). You can also determine the right size of air filter for your system by looking in your HVAC system’s owners manual.

If you need to measure your existing air filter:

  1. Measure the length (L) and the width (W).
  2. Measure the depth (D).
  3. Now combine these measurements as L x W x D.

Keep in mind that the filter’s true dimensions will be different than the manufacturer’s rounded numbers, which are called “nominal size”. For example, a filter may measure 19.5” x 19.5” x 2.5”, but be rounded by the manufacturer to 20” x 20” x 3”.

Shipping & Orders FAQs

A: Furnace air filters are shipped fast and free, via USPS Priority delivery.

A: We ship from Utah. Depending on your location, your filter should arrive within 2-8 days.

A: Just give us a call at 435-637-3567 and we’ll help find a solution for you.

A: We’ll make it right! Give us a call at 435-637-3567.

A: We don’t accept returns, but we want to make sure that you’re happy. Give us a call at 435-637-3567 with any concerns or questions.

A: Did you receive a 5 inch air filter, but ordered a 4” inch filter? Don’t worry! You probably received an air filter with the “nominal size” label, which is different from the actual size.

Our manufacturer rounds up the last number (thickness). So when you order a 20x25x4 filter for example, what you will receive may actually measure 19-7/8″ x 24-7/8″ x 4-3/8″, but is labeled 20x25x5.

Try installing the filter you receive, but if for some reason it doesn’t fit, no worries! Just call 435-637-3567 and we’ll help you out.

Subscription FAQs

A: Sure! If you have more than one property or home, you can create a subscription for each one. Just log into your account, click on “Subscriptions”, and start a new subscription with your same account.

A: Yes! If you need to change the delivery frequency on your subscription, email us at customerservice@fstsystems.com or call us at 435-637-3567 and we’ll take care of it for you.

A: Absolutely! Just email us at customerservice@fstsystems.com or call us at 435-637-3567 and we’ll take care of it for you.

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