Which Way Should You Put an Air Filter Into a Furnace?

Keeping your air filters clean is key to maintaining healthier indoor air. It helps your furnace run more efficiently, saves energy, and even extends its lifespan.

This article will guide you through the process of installing air filters in your furnaces and highlight common mistakes to avoid. 

Understanding Air Filters

You can choose from several types of air filters, each offering specific benefits:

• HEPA filters trap tiny particles, making them ideal for allergy sufferers, but require more frequent changes. 
• Fiberglass filters are cost-effective and catch larger particles, protecting the furnace from dust buildup, but offer lower filtration. 
• Pleated filters enhance airflow and particle capture and are suitable for various furnace types; check MERV ratings to ensure compatibility with your model.

What Does Furnace Filter Rating Mean?

Air filters are evaluated based on the Minimum Efficiency Reporting Value (MERV) scale, which ranges from 1 to 20. 

For households, the United States Environmental Protection Agency suggests using filters with 7-13 MERV rating. These filters provide an optimal balance of airflow and filtration efficiency. 

Identifying Your Furnace Type

Furnaces come in different types, with gas, electric, and oil being the most common.

• Gas furnaces are popular because they are efficient and cost-effective. They burn natural gas to produce heat that spreads throughout the home. 
• Electric furnaces run on electricity and are usually easier to install and maintain. They need filters that capture particles while allowing airflow to avoid overheating.
• Oil furnaces use oil as fuel to generate heat, and similar to gas units, effective filtration is crucial for optimal performance.

The brand of furnace can affect filter installation since different manufacturers have specific designs and requirements for filter size and type. It's best to check the manufacturer's recommendations for the right filter to ensure a proper fit and good performance. 

How Often Should I Change My Filter

You should change your filter at least once in three months. But since many factors can affect the optimal replacement time, it's more effective to monitor the condition of your filter instead of solely depending on a set schedule.

How to Change a Furnace Filter Correctly

Furnace filters are not very expensive, but you want to get the most out of them and your furnace, which starts with installing them correctly.

1. Locate the Filter 

If you don’t know where your filter is, take a moment to find it. It’s usually on the side of your furnace where it connects to the ductwork.

1. Remove and Dispose of the Old Filter 

Take the old filter out. We suggest wearing a dust mask while doing this. Handle the old filter carefully to avoid stirring up dust and debris.

1. Find the Arrows  

Before putting in the new filter, look for the arrow that shows the direction of airflow. It should point away from the air duct that brings air to your unit and towards your furnace. You can mark the airflow direction on your ducts with a marker. This way, the next time you replace the filter, you can point the arrow in the same direction. Also, write the installation date on your new filter to track when you changed it.

1. Check the Filter Size 

  Your old filter will have the correct measurements, so check that your new one is the same size.

1. Insert the New Filter with the Arrow 

  When inserting the new filter ensure the arrow points towards the furnace.

Common Mistakes to Avoid

• Fitting the filter backwards: If the arrow points towards the furnace, it means it is installed improperly which can reduce efficiency and harm your system.
• Not checking for proper fit: Always confirm that your new filter matches the size of your old one; a bad fit can let dust and allergens slip through, affecting air quality.
• Neglecting to turn the furnace back on properly: After replacing the filter, make sure the furnace is fully powered on and working correctly for good heating performance.

Why Choose Atomic Filters?

Choosing Atomic Filters, you can enjoy the benefits of competitive pricing, fast and reliable shipping, and excellent customer service. With a range of MERV ratings and sizes, you can find the perfect filter to meet your home's specific needs and keep your HVAC system running efficiently.

Don't wait—upgrade your air filters today and experience the difference in your indoor environment!