Gas production can occur up to 72 hours after filling the pit. If the gas appears, ensure there is no risk to humans or animals by allowing the gas to be absorbed within the grass or dispersed into the air in safety. Gas will be absorbed in the moisture in the grass. Care must be taken where the silo is close to other buildings. Being heavier than air, the gas can accumulate within enclosed buildings, or in confined spaces at ground level or near walls.
Good ventilation is important to create air movement for gas dispersal.