Brand: Filter King Filter size: 20x20x4 Actual Size: 19.5 x 19.5 x 3.75 4-Inch Filter MERV 8 Filter Rating Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses Residential / Commercial Use
Brand: Filter King Filter size: 20x20x4 Actual Size: 19.5 x 19.5 x 3.75 4-Inch Filter MERV 11 Filter Rating Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses Residential / Commercial Use
Brand: Filter King Filter size: 20x20x4 Actual Size: 19.5 x 19.5 x 3.75 4-Inch Filter MERV 13 Filter Rating Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses Residential / Commercial Use
Brand: Filter King Filter size: 20x20x4 Actual Size: 19.5 x 19.5 x 3.75 MERV 10 Carbon Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Smoke, Odor Residential / Commercial Use
Manufactured in the US
When you purchase a Filter King filter, you can rest assured that you're getting the industry's best 20x20x4 air filter. Our filters deliver clean air to your home by effectively purifying the air as it passes through the filter. They're made of high-quality, durable materials, so you can be confident your filter will hold up well.
All of our 20x20x4 air filters are made in our Alabama warehouse. We take pride in the fact that all of our products are made at our US-based facility, allowing us to keep more jobs and money in the local economy.
When you order a Filter King 20x20x4 air filter, we'll ship it to you quickly and free of charge. We also ship your order quickly. How much time it takes for your order to arrive will depend on your location but for non-custom orders it takes between two and five days to arrive. For custom air filters it may take a little longer.
Changing your 20x20x4 air filters regularly is essential to maintaining your HVAC system in good condition. Doing so will keep your energy bills low and the system working properly. Homeowners often forget to change their filters for months at a time, leading to maintenance problems and higher energy bills.
Many homeowners wonder how often they should change their 20x20x4 furnace filter or 20x20x4 air filter. A general rule of thumb is that air filters should be changed every 30 days when using inexpensive fiberglass filters. Premium pleated filters may last up to 6 months before needing to be changed depending on use.
MERV stands for Minimum Efficiency Reporting Value. It measures how efficiently an air filter removes airborne pollutants. MERV ratings range between 1 and 20, with 1 providing the least amount of filtration and 20 the highest.
You may think the higher the rating, the better, but that's not necessarily true. The higher the MERV rating, the thicker the filter. A thick filter will force your HVAC system to work harder to circulate air throughout your home, resulting in higher energy bills.
Removes Pollen, dust mites, carpet and clothing fibers, cockroach waste, cement dust, hairspray, powders, etc.
20x20x4 air filters with a MERV rating from 4 to 6 work best in medium to heavily trafficked industrial and commercial workplaces. These filters removed large airborne particles that could damage your HVAC system.
They also filter most dust, lint, depending on the MERV rating chosen. Air filters with a MERV rating of 6 are much more effective than regular inexpensive fiberglass filters. At this level, the filter will remove large particles such as dirt, debris, and lints.
Removes Lead dust, Legionella bacteria, milled flour, welding fumes, dust from humidifiers and nebulizers, coal exhaust, smog.
Air filters with a MERV rating from 8 to 13 more effectively filter your air than less expensive lower-rated filters. The higher the rating, the cleaner the air in your home. For better protection against airborne contaminants and high air quality, this category is recommended.
If you or a family member suffers from allergies, you should consider investing in a 20x20x4 air filter with a MERV rating between 11 and 13 to ease your symptoms. At lower ratings, particles such as pet dander, fine dust, and pollen may slip through your filter. A filter rated between 11 to 13 will adequately remove most allergens from your home's air.
In addition to removing common pollutants such as dust, pollen, lint, and mold, a 20x20x4 air filter MERV 11 rating filter’s enhanced filtration efficiency allows it to remove smoke, smog, coughing, and sneezing particles, and pet dander.
20x20x4 furnace filters and air filters rated MERV 13 are the best overall filter you can buy for use in a residential air conditioner or furnace. At this rating, air filters effectively capture and remove a high range of particles, including bacteria, smoke, and some viruses. If you or a loved one are illness prone and need a clean, sterile environment, a MERV 13 rated air filter is worth considering.
Removes: Bacteria and viruses, sneeze and coughing droplets auto emissions and fumes, tobacco smoke, insecticide dust, face powder, microns, radon, carbon dust, salt, combustion emissions, dust lint, etc.
Air filters at this level are primarily used in facilities where airborne contaminants must be eliminated, such as hospitals and laboratories. They are not recommended for residential use because they restrict airflow, and most residential HVAC systems are not equipped to handle them.
In case you have any lingering doubts about 20x20x4 air filters, we have put together a list of the most frequently asked questions.
The type of filter you own will determine how often you should change it. You should change cheap fiberglass filters every 30 days. Change pleated air filters and furnace filters every 90 days.
If someone in your home suffers from asthma or severe allergies, you should change your filter every six weeks to ensure your home has the best quality. If you have pets, you may want to consider changing your filter every two months.
If you notice your air filter is clogged or dirty, you should change it immediately. If you notice dirt building up around your vents, check to see if your filter needs to be changed.
If you're purchasing an air filter 20x20x4 for home use, you should select a filter with a MERV rating from 8 to 13. At this rating, the air filter will efficiently remove allergy-causing particles and allow you to breathe comfortably. For homes with pets and allergy sufferers, MERV 13 filter works better.
If you use your filter in an industrial workplace, choose an air filter with a MERV rating between 4 and 6. For hospital use, choose an air filter with a MERV rating of 14 or higher.
Yes. If for any reason you're not satisfied with your purchase, you can return your to us filter up to 30 days after purchase. All items must be returned in their original condition and original packaging.
We do not accept returns of customized air filters. Customers are responsible for all return shipping costs. You can return items to us using your own shipping label.
Yes. We offer discounts on bulk purchases. Buying more filters at once also means that you’ll get free shipping for your order. Customers only need to order two or more filters at once to take advantage of Furnace King’s free shipping offer. Please contact us for more information.
Shipping with Furnace King is fast, convenient, and with an order of two or more filters, free. Orders from within the contiguous U.S. generally take up to two days to process, while international and custom orders can take up to five days.
Most of our filters ship within two business days. Once an order has gone through, shipping takes three to five business days for orders within the United States.
If you want to ensure you always receive replacement 20x20x4 air filters when it's time to replace your old ones, consider signing up for our air filter delivery service. All you need to do is follow 3 easy steps to be sure you have the cleanest air possible circulating through your home.
To subscribe to the air filter delivery service, tell us what size air filters you need, how many you need, and how often you'd like them delivered. We will auto-ship the air filters you need based on the schedule you select. There are no contracts or obligations, and you can cancel this service at any time.