Silo Ventilation Systems has been working on improving the phosphine handling of chemicals in grain storages over the past 15 years.

Working on OH&S best practice of handling phosphine at ground level, Silo Ventilation Systems has developed a heavy duty Air Intake Vent and Fumigation Chamber to handle the dispensing of Phosphine gases through the principles of installing phosphine from ground level.

This alleviates the need for high risk of installing phosphine tablets off ladders into the tops of the silos.
Proven results have indicated a 2-3 day turn around for gases to pass through grain from the bottom entry AIV by means of natural air convection currents.

This means that the grain is getting a better distribution of gases through the volume of grain stored.
The removal of residue from the AIV is simple from ground level, and of minimal risk compared to climbing the silo ladder and having residue powder blown back into silo directly effecting grain contamination and also human contamination.