PLEASE NOTE THAT THE PICTURE DOES NOT SHOW THE COLLECTOR BOX. The box has 8 18 inch duct collars - 2 on each side of the 4 foot by 20 inch box under the fan that is shown This is a unique Invisco invention that is pending a patent. It uses a very common ceiling mounted whole house fan but is modified to be mounted up high in an attic so the noise is gone. The mod adds a collector box and duct connections so it can be connected to multiple inlets located over bedrooms or hallways. The motor is infinitely variable speed so you can adjust it to run slowly at low power all night. It comes with a speed control and is easy to install. It hangs from your rafters and can plug into any AC outlet in your attic.