Above is the heart of this new high performance whole house fan.
This Tornado ES-6400 pulls 6,320 CFM and the new 2019 price is $2,022.
Why has the price been raised?
No other source offers you air flow so high.
No other source offers you infinitely variable speeds. .
No other source offers you a 16 year warranty.
No other source offers you all this at only 505 watts.
So why $2022??
At Airscape’s price of 36 cents, 6320 CFM would be $2,275.
At QuietCool’s price of 28 cents, 6320 CFM would be $1770.
We think our price of 32 cents for 6320 CFM is fair at $2,022.
If you saw our 2018 price of $1795 you are welcome to send us your down payment of $500 before March 22, 2019. See this page for how to send it.
The ES-6400 is very quiet when hanging from your rafters. It has a damper built in to prevent cold air from falling down in the winter. And you can see the hanging bracket below that makes installation a breeze. The large picture shows how well the motor mounting brackets center the motor and hold it in perfect position above the internal air damper flaps. The brackets have steps that position the motor straight and level. The motor is held by 2 strong stainless steel straps. The propeller has 8 blades each with a 50 degree bite for maximum air flow. It is balanced perfectly to eliminate all vibration at all speeds.
PATENT IS PENDING – here is the secret to the performance
The heart of this incredible performance is the patent pending motor and blade combination. The modern EC motor (electronically commutated) made by US Motors has an incredible amount of available power – called “torque” – and it is made to be able to put out more power than its design parameter (1/2 HP) under special circumstances. That is, if it is cooled by enough air flow, it can put out more than the 1/2 horsepower that it is rated for. Imagine – the motor is designed to put out 1/2 HP under all conditions including the condition of being in a very tight area with very little air movement. It is designed for internal temperatures as high as 240 degrees – enough to boil water.
When it is used in a whole house fan you can imagine it is kept much cooler – the air flowing across it is hardly ever higher than 90 or 100 degrees – the temperature of the air in your home. So if it is asked to provide more than 1/2 horsepower then it will work harder and get hotter inside. As long as the internal temperature does not go over that for which it was designed, it can offer a lot of power or torque. That is the secret to this invention.
Here is how this happened. In 2017 I put a blade on the motor that was designed to pull 4700 CFM at 1250 RPM and load the motor to 1/2 horsepower. This US Motors 1/2 HP motor ran up to full speed at just 1/2 of the speed control input signal. The motor top speed is 1250 RPM and the speed input is 0-10 volts DC. What I found was that the motor got to top speed at just 5 volts DC. So I called US Motors and Jake Schnarr there told me “the motor has more torque to offer you”.
So I ordered a better blade from my source, Multi-Wing, in Ohio. I asked for a 1 HP blade. They sent me one with 8 blades and each one is at a 50 degree pitch – designed to pull over 6000 CFM at 1250 RPM. You can see that blade below. It worked just as I hoped. It loaded the motor so that the speed did not get to full speed but to about 90% of rated speed and the air flow jumped to over 6300 CFM! At the same time the input electric power jumped from 375 watts (1/2 HP) to 505 watts. I knew the motor would have a hot spot so I used my infrared camera to look at the motor. Sure enough, there was a cherry red spot that was 114 degrees F. Not at all a bad temperature. Jake told me the motor could get much hotter without a problem, so we now know that I can get even more air flow from this little motor and blade. We also now know why all the other whole house fan companies think they need bigger blades.
Here are the technical specifications
Air flow variable from 50 CFM to 6,320 CFM using a dial like a light dimmer.
Input AC 120 VAC 1 Phase
Input AC power varies from 50 watts to 505 watts maximum at full speed.
Unit comes in 3 parts:
- Main body with motor, blade and damper is 20 inches diameter by 23 inches long. It is suspended from two rafters using the supplied bar and hanger. It has an electrical box with a 6 foot AC input cord and plug plus a terminal for connection of low voltage thermostat wire for the 3 wire speed control.
- Flexible HVAC duct is 20 inches diameter by 8 feet long.
- Ceiling mounted flange has 22 inch round white frame (shown above) under the 20 inch diameter opening in the ceiling that has the 1/2 inch thick cube core grille. On top is a 20 inch diameter duct collar for connecting the flexible HVAC duct.
Here is a nice install in Salt Lake City – This was done by Casey in 2015.
You can see more testimonials here – TESTIMONIALS
Above is the fan hung from the rafters and below is the intake grille and frame.