Custom Marketing Company (CMC)

Helfer Duct System


The Helfer Duct System is used to aerate grain at 1/10th of a cfm per bushel, cooling it down and preventing overheating or spoilage. These systems are also used to keep the grain in condition and maintain its quality until it can be properly dried or cured. All duct systems have inner structural strength to withstand grain pressure and are easily assembled and disassembled. With large masses of grain stored in bins, quonsets, bunkers or crop circles, Helfer Duct Systems are a perfect fit.


Duct systems can be designed and ordered to fit your specific building, bin size or crop circle. By indicating to us the size of the structure, we can custom design your system to work for you.

Standard Features & Benefits:

  • 15” round perforated ducts come in 48” and 24” lengths
  • Custom designs to fit your application

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