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Atomic Customer Reviews

Based on 653 reviews
Maintenance Kit PCO20-28

OEM product at a great price.

Thank you for the opportunity of reviewing this order. I am ok with my order but would like to know how to obtain a lower price.

Great price and fast delivery

Better deal here than on Amazon. Free shipping too!

Good Quality Filters and Good Service

The website was easy to use, filters are good quality and arrived in a few days. I had a question, and received a reply the same day! I would definitely use Atomic Filters again.


Custom made a odd size filter for me. Fit perfectly and well built
Will be a return customer

Skuttle 000-0448-003 Replacement Media ( 20x20x5 )

Filter is great, traps enough dust to notice the difference. I first put in a MERV 11............actually diminished air flow from A/C. THE MERV 8 IS PERFECT and the price is good, which includes shipping. I will only buy from them every 5-6 months. Well worth it!

Can Breathe Again, No More Watery Eyes.

Our tech guy who services our heater recommended Atomic filters.

We had MERV 8's prior to for about a year and a half.

I noticed when we would run the heater, my eyes watered constantly when in the house. I started to attribute it to the current air filters for our heater.

We switched to the Atomic MERV 13's and not looking back.

I noticed when comparing the Atomic to our other brand MERV 8's, the Atomic filters were superior in every way. Heavier, thicker, cut better. Our MERV 8's for our 10x30x1 weren't always cut right and I would often times have to squeeze or push the sides to get it to fit right into the air filter spacing. 10x30x1 is very difficult to find and happy Atomic has them. The Atomic fit properly, no shoving in the sides, just the right amount of tension and fit.

After using the Atomic filter for about 2-3 weeks, what a difference. No more allergies.

I would highly recommend these filters to everyone.

I will order again when needed.

We got the 6 pack at a great cost too!

Thanks Atomic!

Martin K.


Without the automatic shipment I would probably forget to change the filter. The filter arrived in great shape and the quality of the filter is very good judging from the one I took out!

Consistently excellent service and product

See title

Recent UV Light

Would buy again from Atomic Filters. Great price, free delivery and expedited delivery.


So easy- I don’t even have to think about it!

good buy

good price and good delivery

Clean Sweep

Filters arrived in a timely manner. they were exactly what I had installed in my furnace. Price was great and I am very satisfied with the product.

carbon filters

wonderful has helped so much with my allergies


This was the right filter for out Sears air system.

We received it on time and it was exactly what we ordered.

Great price.

The filter fits. The price was good. I'm not able to comment on it's effectiveness (too soon.) I would have given it five stars, however after I ordered this product, I saw a different one with the same dimensions and rating (MERV 11) that was slightly more in price. I called the company to find out what the difference was and if the more expensive one was a better quality filter. I was not able to reach a person after several attempts. I left a detailed message with my questions about the two filters. They did call me back but I wasn't home, so I still don't know what the difference is. They left a message, but didn't address my questions. That was disappointing.

As advertised

Best price, timely delivery


Perfect fit and fast shipping. I will be back

Nominal Vs. Actual Sizes: Finding the Right Air Filter Size

Buying the Correct Size Air Filter- The Most Important Thing to Know 

When you are buying your air filter online most important thing to know is Air Filters have two sizes that you need to understand the Nominal size and the Actual Size. Not understanding these numbers often leads to consumers purchasing a filter that does not fit their Furnace or HVAC system.

Nominal vs Actual air filter size by Atomic


Understanding Nominal Filters Size Could Save You Time and Money

Not understanding the Nominal Filter Size is the primary culprit for incorrectly purchased filters.The Nominal Size is the usually the dimensions used to Label the filter. For instance 16x20x1. These dimensions are a rounded value on the filters actual measurements. The actual measurements on this filter may be 15.5x19.5x.75, but that could vary by brand and manufacturer. So in order to make sure you have the correct size filter, especially if you are replacing with a different brand it is important to confirm the actual size on the filter. When purchasing filters on the internet the Nominal size is usually found in the product title.

Actual Filter Size- The Key to Making the Right Replacement Filter Purchase

The actual size as you might have guessed are the actual dimensions of the filter by length, width and thickness. This size is often on the filter right below the Nominal size and is usually labeled as the actual size. When you are buying a filter online the actual size is sometime in the product bullet point or the product description. If your filter does not have actual dimensions on the outside of the filter, you can measure you filter to get the correct dimensions. Some brands have a foam gasket on the outside of the filter, in this case, you will want to make sure you have a compatible actual size and that it also has the foam to ensure a snug fit. 

Lennox Air Filter X0851 with Foam strips

Examples of Nominal and Actual Sizes

 Size  Example 1  Example 2
Nominal Size 20x20x1 16x20x1
Actual Size 19.5x19.5x.75 15.75x19.75x.75


 Furnace filters should fit securely but should not have to be forced into position. If you have to force the filter into its slot, then it is probably too big. Forcing an improper filter size in a filter can cause it to buckle, damaging the filter or reducing its ability to function properly. Filters are a smaller than their slot to allow for easy replacement. Some HVAC units may need a filter with dimensions that are unique or uncommon. In these cases, a custom filter needs to be ordered.

Find Your Filter Sizes Easy in 1" Deep Filters , 2" Deep Filters, 4" Deep Filters