Partial Width Airfoil Fans – NPA PW Series
The large use of AC Plenum Fans with direct-driven motors (Arr.4) dominates the actual HVAC market, thanks to its very smart and compact solution for most current applications. The need for VFD (Variable Frequency Drive) is compulsory in most cases to match the motor speed with the fan speed for the desired duty point.
However, there are many requests for AC Plenum Fans with no VFD in the market whereas it is very difficult to match motor and fan speed by using standard wheels.
To overcome this issue, Comefri has developed a smart solution: the Partial width wheel.
It consists of giving 10 different speeds with the same wheel just by reducing the blade width from 100% down to 50%. This huge flexibility almost always allows you to match the motor speed in both 50Hz and 60Hz.
Here below, as an example, NPA 500 PW looked at 2 different meanings:
a. Range of performances allowed by NPA500 from 95% to 50% blade width
b. Aeolus software selection with the different choices with the same Fan NPA 500
NPA Partial Width 100% – 80% – 60% – 50%
