James Shwe of Maroko and Shwe is doing a new design here in January 2020 that has the expected Greenheck Centifugal Upblast Exhausters. James asked me to help him show how much better hybrid rooftops can serve the design.
Below is my analysis – you can see that this turbine design offers far superior air flow than the American upblast design because the air flows up and out with minimum interference. That is why the hybrid offers much higher CFM at much lower power. On top of that is the fact that the turbines are rotated by the slightest breeze and they are proven to pull as much as 4,000 CFM in a 15 MPH breeze. Then note that the Invisco hybrids have infinitely variable speed EC motors so the input power is nearly perfectly linear with speed. As an example, if the 1500 CFM moved by the CUE-121 using 1/2 HP is the CFM needed, and the TP600 is run at a lower speed to match the 1500 CFM then the horsepower needed for that CFM will be just 0.15 HP! ( 1500/6970 times .72 )
Hybrid rooftop ventilators out perform all other rooftops by a wide margin in many applications.