Document ID: chunk:federal_register_of_legislation:F2016L00412:body:0:p18
Version: federal_register_of_legislation:F2016L00412
Segment Type: other
Provision Reference: 
Character Range: 48257–51154

by ventilation.
    * Dilution ventilation dilutes and displaces contaminated air with fresh air which is supplied
      to the work area by mechanical supply fans or natural air currents through doors, windows
      or other openings in the building. It can be used to supplement local exhaust ventilation.
      When using dilution ventilation:
          + the spray painting operator should stay between the air supply inlet and the source
            of vapours or aerosols generated
          + temporary barriers may be needed to channel the dilution ventilation through
            the spray zone and to restrict cross currents
          + make sure the contaminated exhaust air does not re-enter the work area, and
          + use auxiliary mixing fans to disperse the spray painting emissions towards the outlet
            and to enhance the rate of air dilution.

3.3 Spray painting outside a spray booth
Where it is not reasonably practicable to do the spray painting in a booth and it is carried out in
a building or structure other than a confined space, the building or structure should be of open construction or a mechanical exhaust system should be used to prevent the build-up of flammable or toxic fumes.
When spray painting outside a spray booth or outdoors, a spray painting exclusion zone should
be designated around the area where the spray painting is carried out. In general, the exclusion zone should, as far as is reasonably practicable, have at least six metres horizontal and two metres vertical clearance above and below the place where the paint is being applied. However,
in deciding where to establish an exclusion zone and how big it should be, you should consider:
    * the nature of the chemicals, mixture or solvents being sprayed
    * the type of process being used
    * the workplace environment including wind speed, temperature and humidity, and
    * the location of other people.
Greater vertical clearance may be needed when spray painting in stairwells and other areas which allow vertical movement of vapours. A risk assessment will help determine if an exclusion zone is required for low risk processes (such as painting with water-based paints).
Once a spray paint exclusion zone is established, a number of procedures can be used to control risks including:
    * physical barriers and warning signs to prevent unprotected persons from entering the exclusion zone
    * shrouding the area where spraying is to occur to prevent spray drift in walkways, public areas and air conditioning intake vents
    * removing hazardous chemicals that are not needed for spray painting work to reduce unnecessary exposure and fire or explosion risks
    * using low hazard chemicals for surface preparation or cleaning
    * removing stored wastes, like solvent-soaked rags and waste paint, to control fire
      or explosion risks
    * removing electrical