Breathe Easy: A DIY Air Purifier for a Healthier Home
As wildfires ravaged the West Coast, I found myself struggling to cope with the hazardous air quality. With no air filtration system in my home and affordable portable units selling out fast, I was desperate for a solution. That’s when my roommate introduced me to the concept of DIY air purifiers. Intrigued, I decided to take the plunge and learn how to create my own air purifier.
The Simple yet Effective Design
The idea is straightforward: attach air filters to a box fan. But, as I soon discovered, the execution requires some finesse. You’ll need:
- 2 HEPA filters or 2 MERV filters (with a rating of at least 12)
- A box fan
- Packing tape
Understanding MERV vs. HEPA Filters
HEPA filters are the gold standard, capturing 99.97% of particles as small as 0.03 microns, including mold, pollen, dust, and bacteria. MERV filters, on the other hand, remove around 90% of particles that small. For my project, I opted for a MERV 12 filter due to compatibility issues with HEPA filters and box fan sizes.
Assembling the DIY Air Purifier
- Line one filter up against the box fan, applying tape along all four edges to seal it completely. Add extra tape to the corners, as they tend to be rounded.
- Repeat the process with the second filter on the other side of the box fan.
Effectiveness Against Allergens, Dust, and COVID-19
Research suggests that a MERV 13 filter taped to a box fan can be around 80% effective against smoke particles. This implies that it would be even more effective against household allergens like dust mites and cat dander. While some researchers believe air purification can help combat the spread of COVID-19, there’s no concrete evidence to support this claim.
Challenges and Considerations
Before embarking on this project, be prepared for:
- Higher costs than expected: HEPA filters can range from $40 to $55, and MERV filters may cost even more.
- Difficulty finding compatible filter and box fan sizes.
- The importance of 1-inch thick filters to avoid bulky designs.
- The need for a two-person job to ensure proper taping.
- A potentially loud fan noise.
A More Affordable Alternative
If you’re not up for the DIY challenge, consider purchasing a low-end air purifier. I’ve found that a tabletop air purifier by Hisense works well for my 250-square foot room, using a HEPA filter and costing under $100. For more options, refer to our guide for best home air purifiers.
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