How to Replace an Air Purifier Filter (HEPA) – When & How Often to Change

Most Airfire HEPA filters should be replaced every 5–6 months, depending on usage, air quality, and whether you have pets or allergies.

In this guide, you'll learn:
• When to replace your air purifier filter
• How to replace a HEPA filter step by step
• Common mistakes to avoid
• How replacement affects air quality and efficiency

When Should You Replace an Airfire HEPA Filter?

For most users, we recommend replacing your Airfire HEPA filter every 5–6 months.

However, replacement frequency can vary depending on:

• Daily usage time
• Homes with pets
• Allergy or asthma sensitivity
• Indoor air quality levels

Homes with pets, smokers, or wildfire exposure may need replacement every 3–4 months.

If you notice reduced airflow, increased noise, or a filter indicator light, it's likely time for a replacement.

Which Airfire Model Do You Have?

Every Airfire purifier uses a specific filter. Find your model below to get the right replacement:

To maintain optimal performance and warranty coverage, always use genuine Airfire replacement filters designed for your purifier model.

Step-by-Step: How to Replace an Airfire HEPA Filter

Follow these simple steps to replace your filter safely and correctly:

Step 1: Turn Off and Unplug the Unit

Always power off and unplug your Airfire air purifier before opening the unit.

Step 2: Open the Filter Compartment

Remove the back or bottom cover (depending on your model) to access the filter chamber.

Step 3: Remove the Old HEPA Filter

Carefully take out the used filter and dispose of it according to local waste guidelines.

Step 4: Prepare the New Filter

Remove all plastic packaging from the new Airfire HEPA filter before installation. Running the purifier with the wrap still on blocks airflow and can cause it to overheat.

Step 5: Insert the New Filter

Place the filter into the unit, ensuring it fits snugly and follows the correct airflow direction.

Step 6: Close the Cover and Restart

Reattach the cover, plug the unit back in, and power it on.

Common Mistakes to Avoid

Many performance issues come from small installation errors. Avoid these:

• Forgetting to remove the plastic wrap from the new filter
• Installing the filter backwards
• Not fully closing the filter cover
• Failing to reset the filter replacement indicator

Taking a few extra seconds to double-check these steps can significantly extend the life and efficiency of your purifier.

How to Reset the Filter Replacement Indicator

After installing a new filter, reset the indicator light by:

1. Turning on the purifier
2. Pressing and holding the Filter Reset button for 3–5 seconds
3. Waiting until the indicator light turns off

Refer to your model's user manual for exact instructions.

Frequently Asked Questions

How often should I replace my Airfire HEPA filter?
Every 5–6 months under normal use, or every 3–4 months in homes with pets, smoke, or heavy daily use. See our full filter replacement guide.

Can I wash or reuse an Airfire HEPA filter?
No. HEPA filters are not washable and should be replaced when dirty.

Why is my filter indicator still on after replacement?
The indicator must be manually reset after installing a new filter.

Are third-party replacement filters safe to use?
We recommend using only official Airfire replacement filters to maintain performance and warranty coverage.

Final Tips

Regular filter replacement is essential for maintaining clean indoor air. By following this guide and using official Airfire HEPA replacement filters, you can ensure your air purifier continues to protect your home and family.