@raneses I apologize. I think the way I worded a couple sentences was a little confusing. I’ll update that.
To answer your question the 400 is both larger and has a more powerful fan than the 300. The metric you want to look at for air purifiers is Air Changes Per Hour (ACH).
- Airmega 300 in a 1,256 sq ft room will change the air twice in an hour
- Airmega 400 in a 1,560 sq ft room will change the air twice in an hour
Unless you have a really large room, I’m not sure that you’ll notice a huge difference between the 300 and 400 in day-to-day performance. I keep mine on smart mode and the only time the fan spins up to high is when I’m searing a steak.
Appreciate the comment!