Changing your HVAC system's air filter, often referred to as a "fan filter" because it cleans the air before it circulates through the fan, is a simple maintenance task that improves air quality and system efficiency.
Here's how to replace your fan filter:
Step 1: Preparation
Before you begin, gather your supplies: a new filter of the correct size and MERV rating, and a marker. Locate your air filter housing, which is typically near the furnace, air handler, or sometimes in a return air vent in a wall or ceiling. It's also a good idea to turn off your HVAC system at the thermostat or the power switch near the unit for safety.
Step 2: Remove the Old Filter
Open the filter housing door or grill. Carefully slide the old filter out. Pay close attention to the arrow on the side of the filter; this indicates the direction of airflow. You'll need to install the new filter facing the same way.
Step 3: Choose the Right Filter
Select a new filter that matches the size of the old one. The dimensions are usually printed on the side of the filter (e.g., 20x20x1). Filters also have a MERV (Minimum Efficiency Reporting Value) rating, which indicates how well they capture particles. A higher MERV rating means better filtration. As seen in some references, choosing one with a MERV of 11 or similar is a common choice for good residential filtration.
Step 4: Install the New Filter
Slide the new filter into the housing. Make sure the airflow arrow on the new filter points in the same direction as the one on the old filter. This direction is typically towards the furnace or air handler. Ensure the filter sits snugly in the housing.
Step 5: Mark the Date
For easy tracking of when the filter was last changed, use a marker to mark the installation date directly on the filter frame. This helps you remember when it's time to replace it again. Close the filter housing door or replace the grill.
Why Change Your Filter?
Regularly changing your air filter is crucial for:
- Improving Air Quality: Filters trap dust, pollen, pet dander, and other airborne particles, leading to cleaner air inside your home.
- Maintaining System Efficiency: A clogged filter restricts airflow, making your HVAC system work harder, which can increase energy bills and reduce the system's lifespan.
Common Filter Sizes
Air filters come in many standard sizes. Here are a few common examples:
| Height (in) | Width (in) | Depth (in) |
|---|---|---|
| 14 | 20 | 1 |
| 16 | 20 | 1 |
| 16 | 25 | 1 |
| 20 | 20 | 1 |
| 20 | 25 | 1 |
| 20 | 25 | 4 |
| 20 | 25 | 5 |
Always check the size printed on your old filter or in your HVAC manual.
How Often Should You Change It?
The frequency depends on factors like the filter type (thicker filters last longer), household size, presence of pets, and local air quality.
- 1-inch filters: Typically every 30-90 days.
- 4-inch filters: Typically every 6-12 months.
- Homes with pets or allergies: More frequent changes may be necessary.
Check your filter monthly, and change it when it appears dirty.
Quick Tips:
- Always verify the correct filter size and MERV rating for your system.
- Ensure the airflow arrow is pointing correctly.
- Consider setting reminders to change your filter regularly.
Replacing your fan filter is a quick task that significantly contributes to a healthy home environment and efficient HVAC operation.
