Class: Central HEPA Filtration System
Delivered Airflow: 675 CFM (Cubic Feet per Minute)
Dimensions: 14.5" square, 27.25" high
Duct Connections: 10" round intake, 8" round outtake
Power Consumption: 225 Watts

Filter Life:
- Pre-Filter: Washable (12 months)
- HEPA Filter: 2-5 years
- Carbon Filter: 6 months
- Optional V.O.C. Canister: 12 months

Air Changes per Hour (ACH)
1000 sqft     5.1 ACH
1500 sqft     3.4 ACH
2000 sqft     2.5 ACH
2500 sqft         2 ACH
3000 sqft1     1.7 ACH
3500 sqft     1.4 ACH
4000 sqft     1.3 ACH
4500 sqft     1.1 ACH
5000 sqft         1 ACH
Based on 8' ceilings

Generally speaking, the more air changes per hour (ACH) you can provide, the more effective a HEPA filter can be.
1 ACH provides excellent air cleaning results (higher is recommended for people with sensitivities).
Remember: More HEPA is better than less, but some HEPA is better than nothing at all.