When it comes to home improvement and maintaining a comfortable living environment, air filtration is key. A good air filter ensures that the air in your home stays clean, reducing allergens, dust, and even harmful particles. But what happens when you need to switch your filter box size? For example, converting an 18×20 filter box to 20×20 might seem tricky at first, but with a bit of understanding and the right tools, you can do it yourself.

In this article, we will walk you through the entire process of upgrading or converting your filter box from 18×20 to 20×20. Whether you’re doing it because you want to upgrade your air filter system or because of the availability of more convenient filter sizes, this guide is perfect for you. It will be explained in simple steps that anyone can follow, even if you’re not a DIY expert.

Why Would You Need to Convert an 18×20 Filter Box to 20×20?

Before diving into the how-to, let’s first talk about why you would need to convert your filter box size. The main reason for such conversions usually comes down to one of two things:

1. Availability of Filter Sizes: Sometimes, the standard 18×20 filter sizes are out of stock or hard to find. By converting to a 20×20 box, you can use more commonly available filters, which might even offer better filtration or energy efficiency.
2. Improving Airflow Efficiency: A 20×20 filter can allow more air to flow through, which might be useful for improving the efficiency of your heating and cooling system. This could lead to better performance, reduced energy costs, and a more comfortable home.

Converting from 18×20 to 20×20 is a great choice if you’re looking for a cost-effective way to improve your home’s air filtration without a complete overhaul of your HVAC system.

Things You’ll Need for the Conversion

Before starting the conversion process, it’s important to gather all the necessary tools and materials. Here’s a simple checklist of things you will need:

• 20×20 Air Filter (Make sure it’s the right MERV rating for your system)
• Measuring Tape
• Screwdriver
• Utility Knife
• Sealant or Caulk
• Foam Insulation Strips (Optional for a snug fit)
• Piece of Wood or Sheet Metal (For filling the gap, if needed)

These are the basic materials you’ll need to get started. The good news is that most of these tools are common household items. If you don’t already have them, they’re easily available at your local hardware store.

Step-by-Step Guide: Converting 18×20 Filter Box to 20×20

Let’s break down the process into easy-to-follow steps. By the end of this guide, you’ll know exactly how to convert your filter box.

Step 1: Measure the Existing Filter Box

The first thing you need to do is measure the dimensions of the existing 18×20 filter box. You’ll want to get an exact measurement, as sometimes the size listed is slightly different in reality. Use a measuring tape to check the length and width of your current box, and double-check that the 18×20 dimensions are correct.

Once you have the measurements, compare them with the size of the 20×20 filter you plan to use. This will give you a clear idea of how much modification is needed.

Step 2: Remove the Old Filter Box

Next, you need to remove the existing 18×20 filter box from its housing. This might involve unscrewing or un-clipping the filter holder, depending on your HVAC system. It’s always a good idea to turn off your HVAC system before you start working to avoid any accidents.

Once the old filter box is removed, carefully take out the filter and set it aside. You may want to keep the old filter for reference to make sure the new filter will fit.

Step 3: Prepare the New 20×20 Filter Box

Now comes the part where you prepare your new 20×20 filter box. This step involves fitting the new filter into the space left by the old box. If the 20×20 filter is slightly larger than the 18×20 space, you will need to make a few adjustments to the filter box housing.

One simple way to do this is by adding a piece of wood or sheet metal to the sides of the opening to fill the gaps. You can cut the material to fit and secure it with screws or nails. Make sure that the box is secure before moving on.

Step 4: Fit the New Filter into the Space

With the new filter box prepared, it’s time to fit the new 20×20 filter into place. Ensure the filter fits snugly without forcing it. If there are any gaps between the filter and the box, use foam insulation strips or caulking to fill them in. This will help ensure that the filter sits firmly and does not allow any air to bypass it.

Step 5: Seal the Gaps

One of the most important steps in the conversion process is to seal the gaps around the new filter box. Air can easily escape if there are any holes or openings around the filter, reducing the efficiency of the filtration system.

Use sealant or caulk around the edges of the filter box and along the sides where the filter meets the housing. This will prevent any unfiltered air from entering the system and ensure optimal filtration.

Step 6: Test the New Filter Box

Once you have everything in place, it’s time to test the system. Turn your HVAC system back on and check for any unusual sounds or issues. Pay attention to the airflow; it should be smooth and consistent, without any signs of air leakage.

If everything looks good, congratulations! You have successfully converted your 18×20 filter box to a 20×20.

Tips for Maintaining Your New Filter Box

After completing the conversion, it’s important to maintain the new filter box to ensure it continues to work effectively. Here are some tips:

• Check the Filter Regularly: Make sure to check the filter at least once a month. If you live in an area with a lot of dust, you might need to change the filter more often.
• Keep the Area Clean: Dust and debris can accumulate around the filter box, reducing its efficiency. Make sure to clean the area regularly to avoid clogs.
• Use High-Quality Filters: The quality of the filter you use can make a big difference in the effectiveness of your air filtration. Invest in high-quality filters that are suited to your home’s needs.

Conclusion

Converting an 18×20 filter box to a 20×20 is a straightforward process that can have long-lasting benefits for your home. Not only does it allow you to use more common and readily available filters, but it can also improve the overall performance of your HVAC system.