Need more CFM? Then this is the system! 1000 CFM provides 1 ACH for 7500 sq. ft.* Installs easily with two 8” diameter outflow connections and one 14” diameter intake connection. Right and left side knock-outs provide versatility for installation. Unit modules can be combined to increase airflow ratings when required. End door removes for easy filter maintenance. Dual HEPA cartridge design allows for enhanced performance.