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All filters are made in the USA + Get Free Shipping

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REPLACE YOUR AIR FILTERS TODAY!

Filterking offers all main air filter types. Select from the following Air
Filter Sizes below. You can select the thickness of your filter or You can
select your Air Unit brand by clicking Whole House Filter. If you can’t find
your size, please select Custom Filter Sizes.





SEARCH BY FILTER SIZE

0.5-Inch Air Filter 1-Inch Air Filter 2-Inch Air Filter 4-Inch Air Filter Whole
House Filter Custom Air Filters
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 *  
 *  

Didn't find the right size? We can make you a custom size.

Make Your Custom Air Filter


SHOP BY MERV QUALITY

 * Standard
   
   
   MERV 8
   
   
   Select MERV 8
 * Most Popular
   
   
   MERV 11
   
   
   Select MERV 11
 * Recommended
   
   
   MERV 13
   
   
   Select MERV 13


UNBEATABLE FURNACE FILTER PRICING

When it comes to value for money, we’re unbeatable (no, seriously). The best
part? The more you buy, the less you pay.




FREE & FAST SHIPPING

You’re busy; we get that. Activate auto-shipment with us for filter delivery
directly to your doorstep at a delivery frequency of your choosing. Oh, did we
also mention you receive a 5% discount on all future orders on top of 2-5 days
free shipping.


CANCEL WHENEVER

We hate fine print as much as you do. No contracts or commitments! Pause,
change, or cancel your delivery service whenever you need to.


MADE IN THE USA

Not only are all our filters proudly manufactured and assembled here in the USA,
but they also comply with all FTC rules and are certified by regulatory bodies
such as SafeHome™.

With the right air filters, you can protect your loved ones from harmful
airborne allergens and irritants such as:




FAQ'S


HOW OFTEN SHOULD I CHANGE MY FURNACE FILTER?

The general recommendation is to change your furnace filters at least every 90
days. However, this is just a generalized recommendation, and other factors come
into play that can decrease the longevity of the furnace filter.

If you smoke, vape or have indoor pets, it might be better to replace your air
filters every 60 days. If allergies or asthma are an issue in your household,
replacing your filters every month could help keep the air cleaner, especially
with a higher MERV rated filter.


HOW TO CHANGE MY FURNACE FILTER?

Your furnace filter is located in a vent either on an interior wall or in the
ceiling. The vent is usually white, but can sometimes be painted the same color
of the wall. Simply pull the little level on the side to open the vent. Remove
the old filter and replace the new furnace filter.


WHEN SHOULD I CHANGE MY FURNACE FILTER?

When you change your air filters depends on the indoor air quality levels you
want to achieve. While Filter King filters can last 90 days, you may want to
change them sooner. There are several factors that go into when you might want
to switch out the current furnace filter. If you have allergies or asthma, a
fresh filter can help with indoor air quality. If you have pets or smoke, then
changing air filters sooner than 90 days can keep the air quality fresher.


WHERE IS THE AIR FILTER LOCATED?

Depending on your AC unit, the air filter slot may be located in a hard to find
location. First, try checking the blower compartment or return air duct where
the air is cleaned before going through the unit. The unit itself may have the
air filter inserted in a specific location.


CAN I RUN MY FURNACE WITHOUT A FURNACE FILTER?

Yes, but it is not recommended that you do so. There are several issues that
occur for an AC unit, your home air system, and the home itself when an air
filter is not installed. Think of an air filter as a gatekeeper (which really
is), and its purpose is to protect both you and your AC system from dust and
dirt, that if left unfiltered, can cause harm to both you and your AC unit in
the long run.


WHAT HAPPENS IF THE AIR FILTER IS BACKWARDS?

Air filters are built with a tight mesh weave that is designed to capture and
absorb incoming particles. Air is brought through the porous side, and the mesh
weaving allows it to flow in and out while being cleaned. When backwards, air
has a harder time coming through, which means the system will require more
energy to push it through, and thus affecting the quality of air filtration.
When an air system is strained like this, it causes a rise in home energy
billing and possible mechanical damage.


WILL A DIRTY AIR FILTER AFFECT MY AC?

Yes, over time dirty air filters will affect AC more and more. The longer an air
filter is left in a system, the dirtier it becomes, and the more pronounced the
effects will be. There are many factors that determine how long an air filter
can last such as the type of filter, material, home size and daily habits. The
higher the FPR rating system (developed by Home Depot), the longer the filter
lasts. MERV rating is another popular rating system used both locally and
internationally.


WHAT HAPPENS IF THE FURNACE FILTER IS DIRTY?

When your air filter is dirty, the mesh wearing that it consists of becomes
clogged and full of dirt and debris. When this happens, the air that is supposed
to flow forward through the filter has a harder time passing into the air
system. The system will use more energy to try and push the air forward,
straining itself and raising your energy billing in the process. The air inside
your home may also start becoming stagnant and dirt over time since fresh air is
unable to come in.


ARE FURNACE FILTERS IMPORTANT?

Yes, they are very important to any air system they are in. Air systems have no
way of knowing whether the air they are bringing in is clean or dirty. Air
filters are essential to making sure that any air brought in is cleaned before
entering the system. Without filtration, the air coming in from outside may
contain any number of dust, debris pollutants, and allergens.


AIR FILTER BASICS


WHAT ARE HVAC FILTERS?

HVAC is an acronym for "heating, ventilation, and air conditioning." An HVAC is
a system that provides both heating and cooling to residential and commercial
buildings. The ventilation function in an HVAC system uses a furnace filter to
clean the indoor air and replace it with fresh air from the outdoors; this
removes anything in the air ranging from smoke, dust, moisture, and undetectable
gases that decrease ambient air quality.
Learn more about HVAC


WHAT IS MERV RATING?

MERV stands for Minimum Efficiency Reporting Value. In short, a MERV rating lets
you know what air particle size an air filter will trap. A higher rating means
that the filter can trap smaller air particles.
Learn more about MERV ratings


KEEP YOUR HOME CLEAN AND ALLERGEN FREE WITH OUR AC/ FURNACE FILTERS

Clean air should never have to be something you worry about. Approximately 1 in
every 7 Americans has respiratory issues such as Asthma and COPD. Maintain a
healthy home environment for your loved ones today.


DON’T TAKE IT FROM US...OUR CUSTOMERS SAY IT BEST

K
KIRSTEN S.
Verified Buyer
 * 
 * 
 * 
 * 
 * 

07/10/2024


GREAT QUALITY AND PERFECT FIT

Great fit and excellent quality. The filter is very well made and looks like
they actually take time in the making of it. Its not flimsy like other companies
I've ordered from.

c
charles k.
Verified Buyer
 * 
 * 
 * 
 * 
 * 

07/10/2024


FILTERS WORK GREAT RECEIVED 2-BOXES

Filters work great received 2-boxes of 6 each total of 12 great price, also
brought 1-box of 12 9x11x1 filters for our dehumidifier they work great also.
thanks chuck

J
JAMES J.
Verified Buyer
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07/10/2024


CLEANER AIR

my size filter is unique and I'm glad to have such quality custom filters.
compared to what is supplied by my building I now have filters that are as good
as an air cleaner.

C
Camille G.
Verified Buyer
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07/06/2024


JUST WHAT YOU NEED, AND NO FRILLS ARE NEEDED

I haven’t been able to find this filter size anywhere near me, so I was grateful
to find them through Filter King. These filters are high quality and do the job.
I’ll continue to order in the future.

View More Reviews


SHOP BY MERV QUALITY TO SHOP BY MERV RATING

Filter King makes a variety of MERV-rated standard filters for all commercial
and residential HVAC systems, and we can also manufacture custom-sized filters
on request.


GOOD: MERV 8 FILTER

At a minimum, MERV 8 filter can be appropriate for most residential homes. It
can block up to 90% of airborne contaminants such as dust, mold, and pollen.
Recommended for use in basic and standard homes and businesses.


BETTER: MERV 11 FILTER

MERV 11 filter is a mid-level filter, a step higher than MERV 8, and can remove
a much higher percentage of contaminants including pet dander and allergens. Its
recommended for homes with pets and people with mild allergies or anyone looking
for further filtration.


BEST: MERV 13 FILTER

In addition to filtering everything that MERV 11 filter can, MERV 13 air filter
can filter out smoke, smog, and virus carriers. MERV 13 provides the highest
level of filtration and is suitable for homes with people that smoke, have
severe allergies, asthma, and other respiratory issues.


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POPULAR AIR FILTER SIZES:

 * 16x25x1 Air Filters
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Filter King LLC
7301 NW 36th Ct, Miami FL 33147
support@filterking.com
877.570.9755


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