Maintaining clean indoor air is one of the most important aspects of home maintenance. For many homeowners, Filtrete filters are the go-to choice for furnace and air conditioning systems because of their reliability and wide availability. However, standing in the filter aisle can be overwhelming when you are faced with dozens of different ratings, sizes, and specialized features. Choosing the right filter ensures that your HVAC system runs efficiently while keeping dust, allergens, and pollutants out of your living space.
Understanding Filter Performance Ratings
When you look at a filter package, you will see several different numbers. While many brands use the MERV (Minimum Efficiency Reporting Value) scale, Filtrete primarily uses its own system called MPR, or Microparticle Performance Rating. This rating measures the filter’s ability to capture particles between 0.3 and 1 micron in size.
The MPR Scale Explained
The MPR scale generally ranges from 300 to 2800. A lower number, such as 300 or 600, is designed to capture large particles like lint and household dust. These are basic filters that protect your furnace machinery but do little for air quality. Mid-range ratings, like 1000 to 1200, are effective at trapping pollen and pet dander. High-end filters with ratings of 1500 to 2800 are designed to capture microscopic particles, including bacteria, viruses, and smoke.
Comparing MPR to MERV
If you are used to the MERV scale, it is helpful to know how they translate. An MPR of 1000 is roughly equivalent to a MERV 11, while an MPR of 1900 is closer to a MERV 13. Generally, the higher the rating, the more particles the filter can trap, but it also means the filter material is denser, which can sometimes restrict airflow if your system is older.
How to Find the Right Filter Size
Before you purchase a new filter, you must know the exact dimensions required for your system. Using the wrong size can allow unfiltered air to bypass the filter entirely, leading to dust buildup inside your HVAC components and poor air quality in your home.
Check Your Current Filter
The easiest way to find your size is to look at the side of the filter currently installed in your furnace. The dimensions are usually printed in large numbers, such as 16x25x1 or 20x20x1. These numbers represent the length, width, and thickness in inches.
Measure the Filter Slot
If there is no filter currently installed, or if the printing has faded, you can measure the filter slot itself. Use a tape measure to determine the height and width of the opening. It is important to note the difference between “nominal” size and “actual” size. Most filters are sold by their nominal size (the rounded-up number), but they are actually about a quarter-inch smaller to ensure they fit into the slot easily.
Selecting the Right Type for Your Needs
Not every home requires the highest possible filtration level. Your choice should depend on your lifestyle, whether you have pets, and if anyone in your household suffers from respiratory issues.
- Basic Dust and Lint: These filters (MPR 300-600) are best for budget-conscious homeowners who do not have pets or allergies. They keep the furnace clean but do not significantly improve indoor air quality.
- Allergen Defense: These mid-tier filters (MPR 1000-1200) are the standard choice for most families. They effectively remove common allergens like pollen, mold spores, and pet dander from the air.
- Healthy Living: High-performance filters (MPR 1500-2800) are ideal for those with asthma, severe allergies, or homes in areas prone to wildfire smoke. They can capture even the smallest particles, including some bacteria and viruses.
Step-by-Step Guide to Replacing Your Filter
Replacing a furnace filter is a simple DIY task that takes less than five minutes. Following a consistent routine will help extend the life of your heating and cooling system.
- Turn off the system: For safety, turn off your furnace or air conditioner at the thermostat before changing the filter.
- Locate the filter door: This is usually found where the return air duct meets the furnace unit. Some systems have the filter located behind a return air grille on a wall or ceiling.
- Remove the old filter: Slide the old filter out of the slot. Take note of the direction of the arrow printed on the frame.
- Check for dust: Before inserting the new filter, quickly wipe away any visible dust near the slot with a damp cloth.
- Insert the new filter: Slide the new filter in, ensuring the arrow points toward the furnace unit (in the direction of the airflow).
- Close the door and restart: Secure the cover or door and turn your system back on at the thermostat.
When Should You Replace Your Filter?
The standard recommendation is to change a one-inch filter every three months. However, several factors can change this timeline. If you have multiple pets, you may need to change it every 30 to 60 days. During heavy use seasons, such as the peak of summer or the dead of winter, the filter will clog faster because the system is running more frequently.
Signs Your Filter Needs Changing
Aside from the calendar, you can look for physical signs that a change is necessary. If you notice more dust than usual on your furniture, or if your HVAC system seems to be running longer than normal to reach the set temperature, check the filter. A grey, fuzzy, or dark-looking filter is a clear sign that it is full and needs to be replaced immediately.
The Benefits of Regular Filter Changes
Consistently changing your filter is one of the least expensive ways to protect your home. A clean filter allows air to flow freely, which reduces the strain on your HVAC motor. This not only prevents costly repairs but can also lower your monthly energy bills. Furthermore, maintaining high air quality reduces the triggers for allergy and asthma sufferers, making your home a more comfortable environment for everyone.
Conclusion
Choosing the right Filtrete filter is a balance between your air quality needs and your HVAC system’s capabilities. By understanding MPR ratings and ensuring you have the correct size, you can significantly improve the environment inside your home. Remember to check your filter monthly and replace it at least every 90 days to keep your system running at peak performance. For more home maintenance tips, explore our articles on improving indoor air quality and maintaining your home appliances.