Problem with something like the TD-150S is that it's an axial fan and CFM will fall off fast under load. For example, the TD-150S on low will fall off to 62CFM at 0.75" of static pressure and won't run at 1.00" of SP. Even on high, it's only 178CFM at 0.75" SP and 77CDM at 1.00" SP.
Something...