The AirScape 4.4e Whole House Fan (WHF) delivers a maximum of 4,410 CFM (hence the 4.4 in the name) to your home. The "e" in the name represents the ECM motor used in the fan.
From the product website:
24 inch Industrial Grade Fan
ECM motor for outstanding efficiency
Impressive cooling capacity - 4410 High all the way down to 1300 CFM
699W @ speed #6, a remarkable 28 Watts @ speed #1
Whisper quiet - Ranging from 36 dBA on Low up to 60 dBA on High
2nd Generation Controls
Wired Switch and Remote operate together
Web Server allows control from Web browser, tablets or smart phones
"AirScape Whole House Fan 4.4e, featuring 24 in. industrial grade fan with super efficient ECM motor. 4410 to 1300 CFM range. INCLUDES fan and motor, damper box, 2nd Generation Controls, 7 ft. ductwork, mounting hardware, duct tape, 25 ft. of chain, and a white cube core grille. 2nd Generation Controls package includes: 1 x hardwired wall switch, 1 x wireless receiver and 1x hand held wireless transmitter, CAT-5 cables. Features include: Web Control Ready, Quick Connections (RJ-45), Timer, 6 speeds (1300CFM to 4410CFM)."
Other sizes of AirScape Whole House Fans