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Silo Aeration Components

Aeration helps protect the quality of stored grain by passing controlled amounts of air through storages. It stabilises temperature and moisture levels, prevents localised temperature increases or 'hot spots' and discourages moisture migration. Providing too much air can be as harmful as too little, at Customvac we take the time to assess your operation and determine the best match to your needs.

Grain growers and handlers use aeration for a range of quality-related reasons, including to:

  • protect grain quality
  • moisture management
  • store damp grain longer
  • reduce condensation and caking
  • avoid 'hot spots'
  • lower temperature and moisture levels
  • preserve seed germination
  • control insect activity
  • prevent moulding and sprouting
  • avoid chemical residues


Aeration SilosAeration for Silos

Aeration ShedAeration for Sheds

Control of Insects

Controlled aeration lowers the temperature of the grain bulk during long-term storage, reducing insect activity dramatically. To satisfy certain market standards an additional step of fumigation in a sealable storage may be needed to ensure totally insect-free grain at delivery.

A combination of Aeration and Dryacide blanketing is also effective in protecting grain against insects without leaving chemical residues.

Silo sealing greatly assists in insect control but does not provide all benefits that effective aeration can provide.  Aeration fans significantly speed up the removal of toxic gases post fumigation.

Aeration ShedOn-floor ducting


Aeration systems include:

  • various size fans depending on application
  • perforated ducting to distribute air within the storage
  • optional - automatic controllers to select the best fan operating times

Openings are needed at the top of storages to allow exhaust air out and prevent excessive back-pressure. This is especially important if aeration is used on sealed storages - a venting system must be provided on the roof.

Grain on the north west wall of storage heats most because a greater amount of sunshine falls on that area. Shading the storage, painting the external surfaces white or using Zincalume silos reduces the heat load and improves aeration performance.

Poorly-matched equipment reduces aeration performance. Buying your equipment from Customvac means you will get advice from experienced aeration experts who supply detailed operating instructions and back-up after the sale.

Elevated SilosElevated Cone Silos

Various size fans depending on applicationFans to suit all applications

Automatic Control

Automatic aeration controllers take the guesswork out of silo aeration, particularly for long term storage of grain. They change their settings automatically to select the coolest available air and correct operating times.... high performance with less operator input. The cost of an automatic controller is outweighed by the lower risk of grain losses. One unit can control up to 24 storages. Automatic controllers add little to the initial cost per tonne of storage but quickly pay for themselves through better grain quality

Automatic ControlAutomatic Control