Grain Systems Tanks PNEG-1094 - Manual (Page 19)

5. Foundations
PNEG-1094 Farm Grain Bin - 4" Corrugation 19
Centrifugal Fan Pad
1. Fan pad should be poured 2" below the top of bin foundation for all centrifugal fans.
2. A pad for heaters is not required, but is recommended.
3. Recommended pad thickness is four inches (4").
4. If a downwind heater pad is to be installed, the pad width (“C”) should be 48" and extended toward
the bin by 33".
5. Fan discharge should be centered on center line of bin.
6. The fan pad should be perpendicular to bin wall.
Figure 5E Centrifugal Fan Pad
CAUTION
Fan pad and fan must be level and smooth for proper operation. Vibration
problems can result from improper fan leveling.