We’re happy to announce that the 4.4e WHF is currently in stock and we’re moving product out the door.
What makes this an “e” ? The motor is an ECM (electronically commutated motor) which when matched up with the efficient blade design gives a great power profile and low noise.
See the details here: http://airscapefans.com/products/Shop/Natural-Cooling/Whole-House-Fans/AirScape-4.4e-WHF
The following graph shows the energy use profile of the 4.4e as compared to the theoretical efficiency of a fan system.
