The first strategy of the Hierarchy of Controls is to substitute the dangerous chemical with a safer one. Another example is that paint strippers with the solvent methylene chloride are not allowed to be used in residential lead paint removal in Massachusetts. Studies have shown that methylene chloride probably causes cancer. One example is the use of a needle gun instead of abrasive blasting. Another is the removal of lead paint before welding or cutting a steel beam.
Ventilation is a system of removing the air with lead dust in it.
It is broken into two types, general and local. Local Ventilation involves capturing the lead dust right where it is being created. An example is having the HEPA filter vacuum system attached to an abrasive blasting hose. By having a vacuum attached, these particles are sucked up and are captured by the HEPA filter before the worker can breathe them in. It also leaves less dust for clean-up.