Grain Systems PNEG-501 - Manual (Page 7)

7
Fan/Heater Application
FAN APPLICATION GUIDE
NO
YES MAYBE
YES
NO MAYBE
1750RPM Centrifugal Fans
1750RPM Centrifugal fans are normally high performance, medium static pressure
fans. They are normally used for aeration or drying on shorter tanks or when low
resistance grains (corn, soybeans) are processed. These fans may be used with gas
heaters, either mounted on the inlet side of the fan or downwind on the outlet side.
Greater airflow is attained when the heaters are mounted downwind. Fans larger
than 30HP require a 17" tall plenum (floor) so the transition will clear. The
application should be looked at very closely when aerating unusually tall tanks or
high resistance grains (wheat, milo).
3500RPM Centrifugal Fans
3500RPM Centrifugal fans are normally medium preformance high static pressure
fans. They are normally used for aeration on taller tanks or when high resistance
grains (wheat, milo) are processed. These fans are not normally used with heaters.
Although these fans are less expensive than 1750RPM fans they are not normally
used on shallower grain depths because 1750RPM fans give much greater perfor-
mance for the horsepower at shallow depths thus less horsepower is required.