The purpose of this page is to show the very effective work by AEI engineers and to show the improvement made by Kurt Shafer in 2016.
HERE IS THE EXCELLENT SELECTION BY AEI ENGINEERS IN 2012
Affiliated Engineers selected the CSR Edmonds EcoPower hybrid rooftop ventilator for their project in Seattle building the Molecular Engineering building for the University of Washington.
They selected the Australian design over all the American rooftops because of the combination of free gravity airflow and the optional powered air flow that only Edmonds offered at the time.
Here is their description of the stack effect –
HERE IS THE IMPROVEMENT MADE BY KURT SHAFER IN 2016
Kurt Shafer was assigned by Edmonds to be the United States distributor in 2015. Kurt learned that the air flow when powered was far lower than any other American rooftop so he improved on the design by adding a motor and propeller. Here is the result.
And here is the comparison of the result to 2 of the top American rooftop suppliers. The substantial increase in air flow is entirely due to the wide open louvred rain hat.
EDISON POWER REPORT ON HYBRD ROOFTOPS
Note that is says “for low static pressures” – that is because this report was based on tests performed on the Edmonds design that cannot pull air at static pressures over 0.11 inches of water.
INVISCO IMPROVED THE HYBRID TO PULL IN HIGH STATIC PRESSURES
In 2016 Kurt Shafer realized the Edmonds design needed improvement. He asked Edmonds to add a motor and propeller to their design but he was told their engineers preferred to maximize the free gravity air flow by minimizing any obstructions like a big motor. So Kurt modified the design and the result is shown above.
Kurt is communicating with MEP contractors all over the US to educate their mechanical engineers about this breakthrough in performance. The goal is to get the Invisco Tornado rooftop in every new design in 2026 and beyond.
HOT OFF THE PRESS! THE INVISCO TORNADO IS PERFECT FOR GYMNASIUMS AND WAREHOUSES..
Why is this important? Because buildings with offices are not in need of a rooftop ventilator – they have central HVAC units that incorporate ERVs – Energy Recovery Ventilation system – that brings in fresh air and conditions it.
Gymnasiums and warehouses do not need the same air systems.. Gyms need rooftops to pull the moist and odorous air out, warehouses need rooftops to pull air that often has contaminants in it out without regard for the interior temperature.
INVISCO HAS THE BEST ROOFTOP FOR BOTH GYMS AND WAREHOUSES
How do I know? Because Invisco was chosen by James Shwe, MarokoShwe.com, for rooftops on a gymnasium for the Los Angeles suburb, Studio City. Here is a look at the design.
That is a perfect example of an application for the Invisco Tornado.
Here is another VERY valuable application – Fire rated rooftops!
I have invented a fire rated rooftop that does not use a belt to protect the motor from the high heat. It does not have a limitation on the length of time it can pull air at temperatures that are about the same as the exhaust from your car.
Yes, I am talking about fans that can survive temperatures like the ones below in the Lorencook catalog… You can see their best fan can operate for only 2 hours at 1000 degrees F.
I have designed a fan with air flow that enable the motor to run for as long as it can while pulling the hot air through without heating the motor. Here is a cross section of this design that has a patent pending.
If you have any question or comments please call Kurt.
