One of the most common questions homeowners ask about their HVAC system is, “Where is my filter located, and what size is it?” Filters play a vital role in maintaining the efficiency of your heating, ventilation, and air conditioning (HVAC) system and ensuring clean, healthy air in your home. Knowing where your filter is located and what size you need is essential for proper maintenance.
Let’s dive into the answers.
Where Is My Filter Located?
The location of your HVAC filter depends on the type of system you have. Here are the most common places to check:
1. Furnace (Central Air Systems)
If you have a central air system, your filter is likely located in or near your furnace. Here's where you should look:
- Furnace Blower Compartment: Open the access panel to the blower, which is usually near the bottom of the furnace.
- Return Air Vent: In some cases, the filter is placed behind a large grille that serves as a return air vent, commonly found in hallways or ceilings.
2. Air Handler (AC and Heat Pump Systems)
For homes with an air handler, which is part of the air conditioning or heat pump system, the filter is typically found:
- Near the Air Handler: Look inside or adjacent to the air handler cabinet, often in an access panel.
- In a Slot Along the Ductwork: Some systems have the filter installed in a dedicated slot along the return air duct.
3. Ceiling or Wall Mounted Return Grille
Some homes have filters located in return grilles mounted on the ceiling or wall, which draw air back into the system. Simply open the grille, and you’ll find the filter.
4. Behind a Vented Access Panel
In systems with multiple zones, you may have filters in different locations behind vented access panels. These can be located throughout the home.
What Size Is My Filter?
Once you've found your filter, it’s important to know its size so you can purchase the correct replacement. Here's how to determine the size:
1. Check the Current Filter
Most filters have their size printed directly on the frame. It’s usually displayed as three dimensions:
- Width x Height x Depth (e.g., 16 x 20 x 1). The first two numbers are the width and height, while the last number is the depth, or thickness, of the filter.
2. Measure the Filter Yourself
If the size is not printed on the filter or it's worn out, you can measure it yourself:
- Width and Height: Measure the length and width of the filter.
- Depth: Measure the thickness of the filter, which is usually 1 inch, but some systems require 2 or 4-inch filters.
3. Standard vs. Custom Sizes
Most HVAC systems use standard filter sizes, but in some cases, you may need to order a custom size. If you're unsure, consult your HVAC manual or a professional to ensure you're getting the correct filter.
When Should I Change My Filter?
Knowing the location and size of your filter is just the first step. Regular filter changes are essential for maintaining air quality and system performance. Most filters should be changed every 30 to 90 days, depending on the following factors:
- Pets: Homes with pets require more frequent changes due to pet dander.
- Allergies: If someone in your household suffers from allergies, you may want to change your filter more often.
- System Usage: If your HVAC system runs constantly, you may need to replace the filter more frequently.
Conclusion
Finding your filter and determining its size doesn’t have to be complicated. By checking common locations like the furnace blower compartment, return air grille, or air handler, you can quickly locate your filter. Remember to check the dimensions or measure the filter yourself to ensure you get the correct replacement. Regular maintenance will keep your system running smoothly and ensure clean air for your home.
If you're still unsure where your filter is or need help choosing the right size, don’t hesitate to consult your HVAC professional. A little attention to this small component can make a big difference in the comfort and air quality of your home!