Intent 1:
To exempt grain storage bins from the application
of the requirement for mechanical exhaust ventilation [dust-collecting
system] in Sentence 5.3.1.3.(1), and to permit them to be ventilated
by open vent stacks only if mechanical exhaust ventilation is impracticable,
and if the open vent stacks:
- are large enough to allow for air displacement as the
bin is emptied or filled, so that the bin does not become significantly
pressurized or depressurized,
- prevent dust accumulating in vents from obstructing
their effectiveness,
- vent to the exterior the dust-laden air displaced from
the bins, and
- prevent entry of rain or snow from impairing effectiveness
of the vents.