Looking for a simple way to help purify your air at home? Pairing a 20x20x1 air filter with a box fan can help capture airborne particles while keeping air moving through your space.
With a Nordic Pure 20x20x1 air filter and the included adhesive dots, it’s easy to create a DIY box fan air filter setup using a standard 20-inch box fan you already own.*
What Is a Box Fan Air Filter Setup?
A box fan air filter setup combines a standard box fan with an air filter attached to the back of the fan.
As the box fan runs, it pulls air through the air filter. The air filter helps capture airborne particles before the fan circulates the air back into the room.
It’s a simple way to add supplemental air filtration to bedrooms, living spaces, home offices and other areas around your home.
What Size Air Filter Do You Need for a Box Fan?
For a standard 20-inch box fan, a 20x20x1 air filter provides a convenient fit.
For the Nordic Pure box fan setup, you’ll need:
- One Nordic Pure 20x20x1 air filter
- The included adhesive dots
- One standard 20-inch box fan*
*Box fan not included.
How to Put an Air Filter on a Box Fan
Setting up your box fan with an air filter only takes a few steps.
1. Check the airflow direction.
Find the airflow arrow printed on the frame of your Nordic Pure air filter.
2. Position the air filter.
Place the air filter on the back, or intake side, of the box fan with the airflow arrow pointing toward the fan.
3. Secure the air filter.
Use the included adhesive dots to attach the air filter securely to the box fan.
4. Turn on your box fan.
Once everything is secure, turn on the fan to begin pulling air through the air filter.
What Does a Box Fan With an Air Filter Do?
Indoor air can contain particles such as dust, pollen, pet dander and smoke particles. As your box fan pulls air through the attached Nordic Pure air filter, the air filter helps capture airborne particles before the air is circulated back into the room.
The result is an easy way to add supplemental filtration using a box fan you may already have at home.
How Much Can the Air Filters Capture?
Both options are designed to capture a high percentage of airborne particles, including particles in some of the smallest measured ranges.
MERV 13 Filtration
- 0.3–1.0 microns: 85%
- 1.0–3.0 microns: 97%
- 3.0–10.0 microns: 99%
Ultra MERV 16 Filtration
- 0.3–1.0 microns: 96%
- 1.0–3.0 microns: 98%+
- 3.0–10.0 microns: 99%+
That means even at the finest particle range of 0.3–1.0 microns, the MERV 13 air filter captures 85%, while the Ultra MERV 16 air filter captures 96% of particles passing through the air filter.
When Should You Replace Your Box Fan Air Filter?
Check your air filter regularly for visible buildup and changes in airflow. How quickly an air filter needs to be replaced can vary depending on how often you run your box fan and the conditions in your home.
When the air filter becomes dirty or begins restricting airflow, it’s time for a replacement.
An Easy Way to Put Your Box Fan to Work
You don’t necessarily need another appliance to add supplemental air filtration to your space. With a box fan you already own, a Nordic Pure 20x20x1 air filter and the included adhesive dots, you can create a simple setup that helps capture airborne particles as air moves through the air filter.
Ready to try it?
