Converting 18×20 Filter Box to 20×20 Furnace is an essential step for ensuring that your HVAC system functions efficiently. Furnace filters help maintain air quality by trapping dust, allergens, and other particles. An incorrectly sized filter can reduce the system’s effectiveness and lead to poor airflow. This guide will provide step-by-step instructions for upgrading to a larger filter size, which is crucial for both air quality and furnace longevity.
Furnaces are often designed to use filters of specific dimensions. When you need to switch to a 20×20 filter, adjusting your filter box to accommodate this size can enhance both filtration and airflow. Converting an 18×20 filter box to a 20×20 furnace ensures you get the most out of your furnace while also ensuring higher efficiency.
Upgrading your filter box to fit a 20×20 filter allows you to access a wider selection of filters. This conversion can be crucial for finding a filter that is compatible with your furnace’s airflow requirements and your air quality needs. The change is not difficult but requires attention to detail.
In the following sections, we will discuss the process of converting an 18×20 filter box to 20×20 furnace and explain why it might be beneficial. We’ll go through the steps, tools, and considerations to help you make the transition smoothly.
Understanding Filter Sizes
When converting an 18×20 filter box to a 20×20 furnace, it’s important to understand the significance of filter sizes. The number “18×20” refers to the dimensions of the filter (18 inches by 20 inches), while “20×20” denotes a larger filter. The size of the filter plays a critical role in maintaining the efficiency of your HVAC system.
A 20×20 filter provides a larger surface area for trapping particles, which can improve air quality and system performance. Using a smaller filter, like the 18×20, may not capture all the dust, allergens, and particles circulating through the air. Thus, a larger filter offers better filtration, cleaner air, and improved system efficiency.
By converting your filter box to a 20×20 furnace, you can also help reduce wear and tear on the system. More airflow means the furnace does not have to work as hard, potentially extending its lifespan. This is an excellent upgrade for homes that require a more robust filtration system.
In essence, understanding filter sizes is crucial for ensuring that the new 20×20 filter fits correctly, and that your system benefits from better air filtration and optimal performance. Whether you choose a HEPA or other high-efficiency filter, a 20×20 filter will be the more versatile option.
Step-by-Step Guide to Converting the Filter Box
Step 1: Measure the Existing Space
Before converting an 18×20 filter box to a 20×20 furnace, measuring the available space is essential. First, check the size of the filter compartment in your furnace. Measure both the length and width to ensure that the 20×20 filter will fit once modifications are made.
Incorrect measurements can lead to a filter that doesn’t fit, causing airflow issues and system inefficiency. Always measure twice to be sure that you have accurate dimensions for both the filter box and the furnace intake.
Step 2: Modify the Filter Box
Once you have measured the space, you can begin modifying the 18×20 filter box. There are two ways to do this:
- Trimming the 18×20 box: If you’re handy with tools, you can cut the box’s width to increase it to 20 inches. This is the most direct method for fitting a 20×20 filter.
- Using a filter adapter: Alternatively, a filter adapter can be used to create a secure connection between the 18×20 filter box and the new 20×20 filter. This is a great option if you don’t want to cut the box.
By carefully adjusting the box, you can ensure that the new filter fits snugly without compromising the system’s functionality.
Step 3: Install the New Filter
Once the box is modified, place the 20×20 filter into the newly adjusted filter compartment. Make sure the filter sits securely within the box and does not leave any gaps. Any gaps can lead to air bypass, reducing filter efficiency.
Double-check that the filter is aligned properly to ensure optimal performance and air filtration. A tight fit also prevents debris from escaping and ensures that only filtered air circulates through your furnace.
Step 4: Seal Properly
Lastly, ensuring a proper seal is crucial to prevent air leaks. Use a sealant or weatherstripping to close any small gaps between the filter and the box. An improper seal can negatively affect airflow and reduce the filter’s ability to trap particles efficiently.
With everything properly sealed and installed, your 20×20 filter should now fit perfectly, providing better air quality and efficiency.
Tools and Materials Needed
To convert an 18×20 filter box to a 20×20 furnace, you’ll need a few basic tools. Here is a list of what you’ll require:
- Tape Measure: For measuring the dimensions of the filter box and furnace intake.
- Saw (if trimming): A saw may be necessary to adjust the size of the filter box. A handsaw or circular saw should work fine.
- Sealant: A sealant will help ensure there are no gaps after installation.
- Filter Adapter (optional): If you don’t want to cut the box, a filter adapter can be used.
- New 20×20 Filter: The most important item! Ensure it is of high quality to maintain your system’s efficiency.
Having the right tools and materials will make the process much easier and ensure a successful conversion.
Benefits of the Conversion
Converting an 18×20 filter box to a 20×20 furnace comes with numerous advantages:
- Improved Filtration: A 20×20 filter offers more surface area, meaning better air filtration and improved air quality.
- Enhanced Airflow: Larger filters help increase airflow, preventing strain on your furnace and reducing energy consumption.
- System Efficiency: By upgrading to a 20×20 filter, you ensure that your system works optimally, leading to fewer repairs and longer equipment life.
The table below summarizes the key benefits:
| Benefit | Description |
| Improved Filtration | Larger filter traps more dust, allergens, and debris. |
| Enhanced Airflow | Better airflow reduces strain on the furnace. |
| System Efficiency | Optimal airflow and filtration help your furnace run efficiently. |
Converting to a 20×20 furnace filter ensures that your system is running as effectively as possible, improving both air quality and furnace performance.
Maintenance Considerations
Regular maintenance is essential after converting your filter box. Clean or replace your 20×20 filter as recommended by the manufacturer. Filters should be changed every 1-3 months depending on usage and the air quality in your home.
Check the filter regularly for signs of wear or dirt buildup. A clogged filter will reduce airflow and decrease the efficiency of your furnace. Keep an eye on the box for any potential damage, and ensure that the seal remains intact.
By maintaining the newly converted filter box and changing filters regularly, you’ll keep your HVAC system running smoothly for years to come. This proactive approach can help prevent costly repairs and extend the lifespan of your furnace.
Conclusion
Converting 18×20 Filter Box to 20×20 Furnace is a smart decision for improving both air quality and system efficiency. This conversion ensures that your HVAC system operates at its best, providing cleaner air while reducing the strain on your furnace. With the right tools, careful measurements, and proper installation, upgrading to a larger filter size is a straightforward and beneficial process.
FAQs
Can I convert my 18×20 filter box to fit a 20×20 filter without professional help?
Yes, you can convert the box yourself by trimming the sides or using an adapter, as long as you measure carefully and ensure a snug fit.
What is the benefit of using a 20×20 filter instead of an 18×20 filter?
A 20×20 filter provides better filtration, improves airflow, and increases efficiency, leading to cleaner air and less strain on your furnace.
Do I need to replace the entire filter box to fit a 20×20 furnace filter?
No, you can modify your existing 18×20 filter box with a saw or an adapter to accommodate the larger 20×20 filter.
How often should I replace a 20×20 filter in my furnace?
It’s recommended to replace the 20×20 filter every 1 to 3 months, depending on usage and the air quality in your home.
Will converting to a 20×20 filter improve my furnace’s performance?
Yes, converting to a 20×20 filter improves airflow and reduces strain on the furnace, enhancing its performance and energy efficiency.
